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Preparations for Next Moonwalk Simulations Underway (and Underwater) The puzzling surface of Jupiter’s icy moon Europa looms large in this reprocessed color view made from images taken by NASA’s Galileo spacecraft in the late 1990s. The images were assembled into a realistic color view of the surface that approximates how Europa would appear to the human eye. NASA/JPL-Caltech/SETI Institute

With a spacecraft launching soon, the mission will try to answer the question of whether there are ingredients suitable for life in the ocean below Europa’s icy crust.

Deep down, in an ocean beneath its ice shell, Jupiter’s moon Europa might be temperate and nutrient-rich, an ideal environment for some form of life — what scientists would call “habitable.” NASA’s Europa Clipper mission aims to find out.

NASA now is targeting launch no earlier than Monday, Oct. 14, on a SpaceX Falcon Heavy rocket from Launch Complex 39A at NASA’s Kennedy Space Center in Florida.

Europa Clipper’s elongated, looping orbit around Jupiter will minimize the spacecraft’s exposure to intense radiation while allowing it to dive in for close passes by Europa. Using a formidable array of instruments for each of the mission’s 49 flybys, scientists will be able to “see” how thick the moon’s icy shell is and gain a deeper understanding of the vast ocean beneath. They’ll inventory material on the surface that might have come up from below, search for the fingerprints of organic compounds that form life’s building blocks, and sample any gases ejected from the moon for evidence of habitability.

Mission scientists will analyze the results, probing beneath the moon’s frozen shell for signs of a water world capable of supporting life.

This artist’s concept (not to scale) depicts what Europa’s internal structure could look like: an outer shell of ice, perhaps with plumes of material venting from beneath the surface; a deep, global layer of liquid water; and a rocky interior, potentially with hydrothermal vents on the seafloor.NASA/JPL-Caltech

“It’s important to us to paint a picture of what that alien ocean is like — the kind of chemistry or even biochemistry that could be happening there,” said Morgan Cable, an astrobiologist and member of the Europa Clipper science team at NASA’s Jet Propulsion Laboratory in Southern California, which manages the mission.

Ice Investigation

Central to that work is hunting for the types of salts, ices, and organic material that make up the key ingredients of a habitable world. That’s where an imager called MISE (Mapping Imaging Spectrometer for Europa) comes in. Operating in the infrared, the spacecraft’s MISE divides reflected light into various wavelengths to identify the corresponding atoms and molecules.

The mission will also try to locate potential hot spots near Europa’s surface, where plumes could bring deep ocean material closer to the surface, using an instrument called E-THEMIS (Europa Thermal Emission Imaging System), which also operates in the infrared.

Europa Clipper Press Kit

Capturing sharply detailed pictures of Europa’s surface with both a narrow and a wide-image camera is the task of the EIS (Europa Imaging System). “The EIS imagers will give us incredibly high-resolution images to understand how Europa’s surface evolved and is continuing to change,” Cable said.

Gases and Grains

NASA’s Cassini mission spotted a giant plume of water vapor erupting from multiple jets near the south pole of Saturn’s ice-covered moon Enceladus. Europa may also emit misty plumes of water, pulled from its ocean or reservoirs in its shell. Europa Clipper’s instrument called Europa-UVS (Europa Ultraviolet Spectrograph) will search for plumes and can study any material that might be venting into space.

Whether or not Europa has plumes, the spacecraft carries two instruments to analyze the small amount of gas and dust particles ejected from the moon’s surface by impacts with micrometeorites and high-energy particles: MASPEX (MAss SPectrometer for Planetary EXploration/Europa) and SUDA (SUrface Dust Analyzer) will capture the tiny pieces of material ejected from the surface, turning them into charged particles to reveal their composition.  

“The spacecraft will study gas and grains coming off Europa by sticking out its tongue and tasting those grains, breathing in those gases,” said Cable.

Inside and Out

The mission will look at Europa’s external and internal structure in various ways, too, because both have far-reaching implications for the moon’s habitability.

To gain insights into the ice shell’s thickness and the ocean’s existence, along with its depth and salinity, the mission will measure the moon’s induced magnetic field with the ECM (Europa Clipper Magnetometer) and combine that data with measurements of electrical currents from charged particles flowing around Europa — data provided by PIMS (Plasma Instrument for Magnetic Sounding).

In addition, scientists will look for details on everything from the presence of the ocean to the structure and topography of the ice using REASON (Radar for Europa Assessment and Sounding to Near-surface), which will peer up to 18 miles (29 kilometers) into the shell — itself a potentially habitable environment. Measuring the changes that Europa’s gravity causes in radio signals should help nail down ice thickness and ocean depth.

“Non-icy materials on the surface could get moved into deep interior pockets of briny water within the icy shell,” said Steve Vance, an astrobiologist and geophysicist who also is a member of the Europa Clipper science team at JPL. “Some might be large enough to be considered lakes, or at least ponds.”

Using the data gathered to inform extensive computer modeling of Europa’s interior structure also could reveal the ocean’s composition and allow estimates of its temperature profile, Vance said.

Whatever conditions are discovered, the findings will open a new chapter in the search for life beyond Earth. “It’s almost certain Europa Clipper will raise as many questions or more than it answers — a whole different class than the ones we’ve been thinking of for the last 25 years,” Vance said.

More About Europa Clipper

Europa Clipper’s three main science objectives are to determine the thickness of the moon’s icy shell and its interactions with the ocean below, to investigate its composition, and to characterize its geology. The mission’s detailed exploration of Europa will help scientists better understand the astrobiological potential for habitable worlds beyond our planet.

To learn more about the science instruments aboard Europa Clipper and the institutions provide them, visit:

https://europa.nasa.gov/spacecraft/instruments

Managed by Caltech in Pasadena, California, NASA’s Jet Propulsion Laboratory leads the development of the Europa Clipper mission in partnership with the Johns Hopkins Applied Physics Laboratory in Laurel, Maryland, for NASA’s Science Mission Directorate in Washington. APL designed the main spacecraft body in collaboration with JPL and NASA’s Goddard Space Flight Center in Greenbelt, Maryland, NASA’s Marshall Space Flight Center in Huntsville, Alabama, and NASA’s Langley Research Center in Hampton, Virginia. The Planetary Missions Program Office at Marshall executes program management of the Europa Clipper mission.

NASA’s Launch Services Program, based at Kennedy, manages the launch service for the Europa Clipper spacecraft, which will launch on a SpaceX Falcon Heavy rocket from Launch Complex 39A at Kennedy.

Find more information about Europa here:

https://europa.nasa.gov

8 Things to Know About Europa Clipper Europa Clipper Teachable Moment NASA’s Europa Clipper Gets Its Giant Solar Arrays Europa Clipper Launch Bingo News Media Contacts

Gretchen McCartney
Jet Propulsion Laboratory, Pasadena, Calif. 
818-393-6215 
gretchen.p.mccartney@jpl.nasa.gov 

Karen Fox / Molly Wasser
NASA Headquarters, Washington
202-358-1600
karen.c.fox@nasa.gov / molly.l.wasser@nasa.gov

Written by Pat Brennan

2024-138

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Details Last Updated Oct 12, 2024 Related Terms

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Explore More 5 min read Journey to a Water World: NASA’s Europa Clipper Is Ready to Launch Article 1 day ago 4 min read First Greenhouse Gas Plumes Detected With NASA-Designed Instrument Article 4 days ago 5 min read Does Distant Planet Host Volcanic Moon Like Jupiter’s Io? Article 4 days ago Keep Exploring Discover Related Topics

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In 2012, astronomers detected a gas giant transiting in front of WASP-49A, a G-type star located about 635 light-years from Earth. The data obtained by the WASP survey indicated that this exoplanet (WASP-49 b) is a gas giant roughly the same size as Jupiter and 37% as massive. In 2017, WASP-49 b was found to have an extensive cloud of sodium, which was confounding to scientists. Further observations in 2019 using the Hubble Space Telescope detected the presence of other minerals, including magnesium and iron, which appeared to be magnetically bound to the gas giant.

WASP-49 b and its star are predominantly composed of hydrogen and helium, with only trace amounts of sodium – not enough to account for this cloud. In addition, there was no indication of how this sodium cloud was ejected into space. In our Solar System, gas emissions from Jupiter’s volcanic moon Io create a similar phenomenon. In a recent study, an international team led by scientists from NASA’s Jet Propulsion Laboratory found potential evidence of a rocky, volcanic moon orbiting WASP-49 b. While not yet confirmed, the presence of a volcanic exomoon around this gas giant could explain the presence of this sodium cloud.

The study was led by Apurva Oza, a former postdoctoral researcher at NASA’s Jet Propulsion Laboratory and now a staff scientist at Caltech. He was joined by colleagues from NASA JPL and researchers from the European Southern Observatory (ESO), the Indian Institute of Astrophysics, the Caltech/IPAC-NASA Exoplanet Science Institute, the Institute of Science and Technology Austria (ISTA), the Birla Institute of Technology and Science, and multiple universities. The paper that details their findings was recently published in The Astrophysical Letters.

Io is the most volcanic body in our Solar System, with hundreds of active volcanoes and extensive lava formations. This activity is the result of tidal interaction with Jupiter’s powerful gravitational field, which causes the interior of Io to flex and contract, creating dense lava flows that break through the surface. These volcanoes spew lava up to 300 km (186 mi) into space, along with sulfur dioxide, sodium, potassium, and other gases, creating a massive cloud around Jupiter up to 1,000 times the planet’s radius.

While the team’s observations did not detect any exomoons directly around WASP-49 b, a massive sodium cloud could constitute indirect evidence of a volcanic moon that is simply too small and dim to detect. For years, Oza has investigated how exomoons might be detected via their volcanic activity. To determine if this was the case around WASP-49 b, he and the team observed WASP-49 b over time using the Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations (ESPRESSO) on the ESO’s Very Large Telescope (VLT).

This proved quite challenging because of the distance involved and the way the star, planet, and cloud often overlap, making it very difficult to distinguish between them. Nevertheless, their observations revealed several pieces of evidence that suggest that a separate body is responsible for the sodium cloud. For example, their observations indicated that the cloud suddenly increased in size during two observations, suggesting it was being replenished. In fact, they estimate that the cloud is replenished at a rate of 100,000 kg (220,000 lbs) per second.

They also observed the cloud moving faster than the planet, suggesting it was generated by another body orbiting faster than the planet. “We think this is a really critical piece of evidence,” said Oza. “The cloud is moving in the opposite direction that physics tells us it should be going if it were part of the planet’s atmosphere.” Their observations also noted something interesting as WASP-49 b orbited its parent star every 2.8 days. During this time, the cloud appeared and disappeared behind the star or the planet irregularly.

This artist’s concept depicts a potential volcanic moon between the exoplanet WASP-49 b, left, and its parent star. Credit: NASA/JPL-Caltech

To address this, the team also used a computer model to simulate the presence of an exomoon and compare it to their observations. Their results showed that an exomoon with an orbital period of eight hours could explain the cloud’s motion and activity, including how it appeared to pass in front of the planet and will disappear and reappear at intervals. Another takeaway from this study was what it suggests about this possible exomoon’s future.

If WASP-49 b is similar in size to Earth’s Moon, Oza and his colleagues estimate that the tidal interaction with the planet’s gravity and its rapid mass loss will eventually cause it to disintegrate. “If there really is a moon there, it will have a very destructive ending,” said Oza. While these observations are intriguing, the team emphasizes that follow-up observations are needed to learn more about the cloud’s orbit and structure.

Further Reading: NASA, The Astrophysical Letters

The post A Possible Exomoon Could be Volcanic, like Jupiter’s Moon Io appeared first on Universe Today.

NASA canvases the areas impacted by Hurricane Milton using cloud-penetrating L-band radar providing responders insight into flooding across Florida.NASA

In the wake of Hurricane Milton, NASA is deploying resources to support Federal Emergency Management Agency (FEMA) and state emergency management agencies to aid their response effort including satellite and aerial data collection.

The agency’s Disasters Response Coordination System and Airborne Science Program are began conducting flights Friday to provide emergency responders with better insight into flooding, damage in Florida, and debris.

“After the devastating impact from hurricanes Helene and Milton, NASA immediately sprang into action,” said Karen St. Germain, director, Earth Sciences Division at NASA Headquarters in Washington. “Whether it is through observations from space or from airplanes, NASA is ready to assist communities affected by severe storms. We are working together with our federal and state partners to provide a better understanding of what is happening on the ground, in real time. NASA’s Disasters Response Coordination System was designed with the goal of delivering trusted, actionable Earth science information, where and when people need it, to enable effective response when these events strike.”

NASA’s Uninhabited Aerial Synthetic Aperture Radar Vehicle (UAVSAR) instrument is gathering rapid wide area L-Band synthetic aperture radar data shared directly with FEMA and other organizations. Flights are coordinated directly with FEMA to augment their existing satellite and aerial data collection.

Since Hurricane Milton struck, persistent cloud cover over the State of Florida has made it challenging to obtain optical satellite observations of conditions in the region. Synthetic aperture radar instruments, such as those aboard UAVSAR, can see through the clouds to observe changes on the ground. This provides much-needed observations of flood inundation across communities in Florida, as well as the extent of inland river flooding and resource deployment.

The Disaster Response Coordination System has been working closely with FEMA and state emergency management agencies to aid response efforts as Hurricane Milton approached and impacted Florida. The team is actively sharing resources with other agency partners, the state of Florida, and disaster response non-profit organizations.  

NASA continues to determine the needs of its partners and is sharing maps and data on the NASA Disasters Mapping Portal as they become available.

Hurricane Milton caused significant wind, flooding, power outages, and damage across central Florida, from Sarasota and Tampa to Palm Springs and the Space Coast. Impacts are currently being assessed alongside lifesaving operations and emergency repairs. The Disasters Response Coordination System is collaborating directly with FEMA, the State of Florida Geospatial Information Office, U.S. Geological Survey, NOAA (National Oceanic and Atmospheric Administration), and the American Red Cross. The Disasters Response Coordination System is also sharing any available Earth observation data with NASA’s Kennedy Space Center emergency managers to support their damage assessment process.

By using tools like NASA’s Black Marble, and updating daily with differential analysis done to highlight areas with extended power outages, the agency provides FEMA, states, and non-profits the opportunity to distribute temporary generators, life-sustaining resources, and damage assessments.

The UAVSAR flights are being conducted with support from NASA’s Disasters Program, NASA’s Earth Action Program, and NASA’s Research and Analysis Program, and are being managed by NASA’s Armstrong Flight Research Center in Edwards, California,  a NASA’s Jet Propulsion Laboratory in Southern and California, and the California Institute of Technology.

To learn more about NASA’s Disaster Response Coordination System, visit:

https://disastersresponsecoordinationsystem.gov

SpaceX will launch its fifth Starship launch test, called Starship Flight 5, in what will be an audacious attempt to capture the giant rocket's booster at its launch site on Sunday, Oct. 13.

SpaceX's Crew-8 astronaut mission for NASA was scheduled to depart the International Space Station early Sunday morning (Oct. 13), but NASA and SpaceX waved off the attempt due to weather.

NASA has postponed the launch of its next flagship mission to Jupiter by at least another day due to the impact of Hurricane Milton at its Florida launch site.

On Episode 132 of This Week In Space, Rod and Tariq talk with Lynn Rothschild on how mushroom mycelia might be utilized as a Mars habitat-building resource.

Comet McNaught, the Great Comet of 2007,

Support from the Biden-Harris administration has boosted the already burgeoning electric school bus industry, and those gains should last no matter who wins the election

The U.S. Federal Aviation Administration announced on Friday (Oct. 11) that it has given SpaceX the green light to resume launches of its workhorse Falcon 9 rocket.

Read the latest news about SpaceX's Starship megarocket test flights, launches, photos and more.

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Sols 4329-4330: Continuing Downhill A post-drive image from NASA’s Mars rover Curiosity showcases the rover’s two front wheels. The right front wheel is parked on top of a rock, which altered the science team’s plan for the day. This image was taken by the Front Hazard Avoidance Camera (Front Hazcam) aboard Curiosity on sol 4328 — Martian day 4,328 of the Mars Science Laboratory mission — on Oct. 9, 2024, at 02:30:55 UTC. NASA/JPL-Caltech

Earth planning date: Wednesday, Oct. 9, 2024

Curiosity is continuing to make good progress downhill along the western edge of the Gediz Vallis channel, allowing us to take another look from a different perspective at this area we’ve spent many months exploring. The drive from Monday’s plan executed as expected, positioning us about 30 meters (about 98 feet) north of our last location. Unfortunately, the rover parked with its right front wheel atop an unstable-looking rock, so we decided to keep the arm stowed rather than risk having the wheel slip with the arm unstowed.

As a consequence, our plan today is all remote sensing, kicking off with a LIBS activity on a bedrock target “Sapphire Lake”  and long distance RMI mosaics of “Pinnacle Ridge,” which avid readers may remember was a focus of an imaging campaign while we were still in the channel. Mastcam gets its turn on both Sapphire Lake and Pinnacle Ridge, as well as a Mastcam-exclusive target, “Wuksachi,” to document some rover-disturbed regolith and a wheel-scuffed rock surface. This plan’s drive is also in the first sol, which will hopefully bring us nearly 40 meters (about 131 feet) further north, closer to our eventual exit from Gediz Vallis.

The first sol also sees a small collection of environmental science observations, including Navcam images to monitor dust and sand on the rover deck as well as a Navcam movie looking out over the northern horizon to look for clouds. We haven’t been seeing many clouds lately, but we are rapidly approaching the end of the current Mars Year, and the end of the dusty season. (The new year, numbered 38, begins Nov. 12; a Martian year is much longer than one on Earth, taking 687 Earth days to orbit the Sun.) Though the cloudy season won’t really pick up steam until February, the “noctilucent cloud season” will be taking place in December and January, which has produced some spectacular images in the past. Today’s plan also features an “UltraSPENDI,” or “Shunt Prevention ENV Navcam Drop-In.” This activity takes 18 cloud movies and dust devil movies over three hours and serves to prevent the rover’s batteries from remaining fully charged for an extended period of time, which would hurt their long-term health.

The second sol of this plan is pretty simple, featuring a Mastcam tau to measure the amount of dust in the atmosphere, a ChemCam AEGIS activity, some more Navcam deck monitoring, and a 360-degree Navcam survey for dust devils around the rover. As always, REMS, RAD, and DAN will be continuing with their usual activities.

Written by Conor Hayes, graduate student at York University

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Oct 11, 2024

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29 Min Read The Next Full Moon is a Supermoon, and the Hunter’s Moon

A supermoon rises behind the U.S. Capitol, on March 9, 2020, in Washington.

Credits:
NASA/Joel Kowsky

The Next Full Moon is a Supermoon; the Hunter’s Moon; the Travel Moon, the Dying Grass Moon, or the Sanguine or Blood Moon; the start of Sukkoth; Sharad Purnima, Kumara Purnima, Kojagari Purnima, Navanna Purnima Kojagrat Purnima, or Kaumudi Purnima; the end of Vassa and Pavarana; the Thadingyut Festival Moon; the end of the Phaung Daw U Pagoda Festival; and Vap Poya.

The next full Moon will be Thursday morning, Oct. 17, 2024, at 7:26 a.m. EDT. This will be late Wednesday night for the International Date Line West time zone and early Friday morning from New Zealand Time eastwards to the International Date Line. The Moon will appear full for about three days around this time, from Tuesday evening through Friday morning.

This will be the third of four consecutive supermoons (and the brightest by a tiny margin).

As the full Moon after the Harvest Moon, this will be the Hunter’s Moon. The earliest written use of the term “Hunter’s Moon” identified in the Oxford English Dictionary is from 1710. According to the Farmer’s Almanac, with the leaves falling and the deer fattened, it is time to hunt. Since the harvesters have reaped the fields, hunters can easily see the animals that have come out to glean (and the foxes that have come out to prey upon them).

The Maine Farmer’s Almanac first published Native American names for the full Moons in the 1930s. Over time these names have become widely known and used.

According to this almanac, as the full Moon in October the Algonquin tribes in what is now the northeastern United States called this the Travel Moon, the Dying Grass Moon, or the Sanguine or Blood Moon. Some sources indicate that the Dying Grass, Sanguine, and Blood Moon names are related to the turning of the leaves and dying back of plants with the start of fall. Others indicate that the names Sanguine and Blood Moon are associated with hunting to prepare for winter. I have read that the name “Travel Moon” comes from observing the migration of birds and other animals preparing for the winter. I don’t know, but this name may also refer to the season when the more northern tribes would move down from the mountains for the winter. For example, both the Iroquois and Algonquin would hunt in the Adirondack Mountains during the summertime but leave in fall to avoid the harsh mountain winters.

As the full Moon in the Hebrew month of Tishrei, this full Moon falls near the start of Sukkoth, a 7-day holiday starting on the 15th day of the month. Sukkoth is also known as the Feast of Tabernacles or the Feast of the Ingathering. Sukkoth honors both the sheltering of the People of Israel during the 40 years in the wilderness in the Book of Leviticus as well as an ancient harvest festival in the Book of Exodus. Sukkot is named for the sukkah (booths or huts) traditionally built for the occasion that represent the temporary huts in which Israelites lived after escaping from Egypt. Families symbolically invite ancestors to share meals in the sukkah and spend as much time as possible there throughout the week. This year Sukkoth starts at sunset on October 16 and ends at sunset on October 23. See https://en.wikipedia.org/wiki/Sukkot for more information.

For Hindus, this is Sharad Purnima, also known as Kumara Purnima, Kojagari Purnima, Navanna Purnima Kojagrat Purnima, or Kaumudi Purnima. This is a harvest festival celebrated in a variety of ways. See https://en.wikipedia.org/wiki/Sharad_Purnima for more information.

For Buddhists, this Moon marks the end of Vassa, the three-month period of fasting for monks tied to the monsoons (Vassa is sometimes given the English names “Rains Retreat” or “Buddhist Lent”). There are numerous festivals and holy days associated with this Moon at the end of Vassa. Many Buddhists observe the holy day Pavarana on this day.

In Myanmar, this full Moon corresponds with the three-day Thadingyut Festival of Lights, also known as the Lighting Festival of Myanmar.

Also in Myanmar, this full Moon is near the end of the Phaung Daw U Pagoda Festival. This festival began on the first Waxing Moon day of the month of Thadingyut and will end a few days past this full Moon.

In Sri Lanka, this is Vap Poya, which is followed (usually within the lunar month) by the Kathina festival, during which people give gifts to the monks, particularly new robes (so this lunar month is sometimes called the Month of Robes).

In many traditional Moon-based calendars the full Moons fall on or near the middle of each month. This full Moon is near the middle of the ninth month of the Chinese year of the Dragon and Rabi’ al-Thani, also called Rabiʽ al-Akhir, the fourth month of the Islamic year.

As usual, the wearing of suitably celebratory celestial attire is encouraged in honor of the full Moon. Enjoy this harvest season, remember your ancestors, and consider camping out with your family. Here’s wishing you safe travels!

Summary of Key Celestial Events

Here are more celestial events between now and the full Moon after next (with specific times and angles based on the location of NASA Headquarters in Washington, D.C.):

As Autumn continues the daily periods of sunlight continue shortening. On Thursday, Oct. 17, (the day of the full Moon), morning twilight will begin at 6:22 a.m. EDT, sunrise will be at 7:20 a.m., solar noon will be at 12:53 p.m. when the Sun will reach its maximum altitude of 41.5 degrees, sunset will be at 6:26 p.m., and evening twilight will end at 7:24 p.m.. By Friday, Nov. 15, (the day of the full Moon after next), we will have switched from Daylight Saving to Standard Time. Morning twilight will begin at 5:51 a.m. EST, sunrise will be at 6:51 AM, solar noon will be at 11:53 a.m. when the Sun will reach its maximum altitude of 32.4 degrees, sunset will be at 4:54 p.m., and evening twilight will end at 5:55 p.m.

This should be a good season for Saturn viewing, especially through a backyard telescope. Saturn was at its closest and brightest the night of September 7. It will be shifting west each evening, making it higher in the sky and friendlier for evening viewing (particularly for children with earlier bedtimes). Through a telescope you should be able to see Saturn’s bright moon Titan and its rings. The rings are appearing thinner and will be edge-on to the Earth by early 2025. We won’t get the “classic” view of Saturn with its rings again until 2026.

Comets

Two comets might be visible during this lunar cycle. For both of these comets I recommend paying attention to the news and checking out local astronomy websites, as we should have better forecasts of how these comets are behaving as we get closer to the opportunities for prime viewing. Particularly for the newly discovered Comet C/2024 S1 (ATLAS), others (with newer information and better modeling tools) should be able to provide better guidance on when and where to look.

Comet C/2023 A3 (Tsuchinshan-ATLAS) has already survived its close pass by the Sun and will be its closest to the Earth on October 12 (five days before the full Moon). After its closest approach it will be in the evening sky as twilight ends. If it continues on its current brightness curve it should be visible with binoculars and (under good conditions) with the unaided eye for at least a few evenings after the 12th, dimming as it moves away from the Sun and the Earth. On October 12, as evening twilight ends (at 7:31 p.m. EDT) the comet will be 4 degrees above the western horizon to the right of Venus (at an estimated visual magnitude of 2.9). As twilight ends on October 13 it will be 10 degrees above the western horizon (magnitude 3), 12 degrees on October 14 (magnitude 3.2), 16 degrees on October 15 (magnitude 3.3), etc. Current brightness curves predict it will dim to magnitude 6.2 by the end of October (nearing the edge of visibility with the unaided eye under dark and clear conditions).

Comet C/2024 S1 (ATLAS) was discovered recently. It’s gotten a lot of attention because if it doesn’t break up as it approaches the Sun, it may become bright enough to see during the daytime. However, I want to avoid raising unrealistic expectations. From the information I’ve been able to find so far, I expect that at night this comet will only be visible with binoculars or a telescope, as its path will not bring it very close to the Earth. For the Washington, D.C. area (and similar latitudes) this comet will be above the horizon before morning twilight begins from now to October 21 as the comet falls towards the Sun. If it doesn’t break into pieces too small to see around closest approach, it should also be visible (with binoculars or a telescope) from November 2 to December 19 as the comet speeds away from the Sun.

However, it is a sungrazing comet and will be passing just a few solar radii from the surface of the Sun. This is so close that the sunlight will be more than 14,000 times brighter than at Earth. Sunlight this intense may cause it to break up and evaporate. But if it remains intact, based on the estimates I have while writing this, the comet will be bright enough to see during the daylight for about an hour or two around closest approach.

One brightness model estimates this comet will be brighter than magnitude -5 from 7:12 a.m. to 8:06 a.m. EDT. Based on this timing, Africa, Europe, and South America are best situated to see this daylight comet. From the East Coast of North America the comet at its brightest will be to the lower left of the Sun just after sunrise, which means we will be viewing it through more air, increasing the chance of interference from scattered sunlight and clouds.

To look for this comet during the short period when it is very close to the Sun, find out for your location which side of the Sun the comet will be on, then find something to block the Sun (e.g., a house or building, etc., the farther away the better) so you can look for the comet without staring at the Sun. Be careful and plan ahead, as it may be difficult to find a location that has both a clear view to the right part of the east-southeastern horizon and a large overhanging object to block the Sun while allowing you to see to the lower left of the Sun. I strongly recommend AGAINST using binoculars or a telescope because accidentally using high powered lenses to focus intense sunlight into your eyes is a blindingly bad idea.

If you are interested, here is some more background on Comet C/2024 S1 (ATLAS). Otherwise, skip this paragraph. This comet was discovered on Sept. 27, 2024, by one of the Asteroid Terrestrial-impact Last Alert System (ATLAS) telescopes in Hawaii. This comet’s orbit suggests it is part of a family of comets called Kreutz sungrazers that pass very close to the Sun. These comets are thought to be fragments of a large sungrazing comet, the Great Comet of 1106, that broke up as it swung around the Sun 918 years ago. This 1106 comet might itself be a fragment of an even larger sungrazing comet, possibly the Great Comet of 371 BC (also known as Aristotle’s Comet). This comet was so bright it cast shadows at night like the full Moon. Several other members of this comet family have been great comets, including the Great Comet of 1843 and the Great Comet of 1882. The most recent great comet from this family was Comet Ikeya–Seki in 1965. Since its launch in 1995, the Solar and Heliospheric Observatory (SOHO) satellite has observed more than 4000 smaller Kreutz sungrazers, some only a few meters across, with none of these smaller comets surviving their close pass by the Sun.

Meteor Showers

Five meteor showers are predicted to peak during this lunar cycle. Three meteor showers peak between October 18 and 24 when the light of the waning Moon will interfere, the most significant being the Orionids peaking on October 21. While the Orionids tend to be brighter than average and to peak at about 20 meteors per hour (under ideal conditions), the light of the waning gibbous Moon will make these harder to see this year, especially from our light-polluted urban areas. Two minor meteor showers will peak in early November. These showers are the Southern Taurids (peaking at 7 meteors per hour on November 5) and the Northern Taurids (peaking at 5 meteors per hour on November 12). These showers overlap to produce their highest combined rate around November 5, but this rate is low enough that seeing these meteors from urban locations will be difficult.

Evening Sky Highlights

On the evening of Thursday, Oct. 17, 2024 (the evening of the full Moon), as twilight ends (at 7:24 p.m. EDT), the rising Moon will be 9 degrees above the eastern horizon. Saturn will be 27 degrees above the southeastern horizon. Bright Venus will be 6 degrees above the west-southwestern horizon. Comet C/2023 A3 (Tsuchinshan-ATLAS) will be to the upper right of Venus at 22 degrees above the western horizon (at a visual magnitude of 3.7 if it continues to follow its current brightness curve). The bright star closest to overhead will be Deneb at 80 degrees above the northeastern horizon. Deneb (visual magnitude 1.3) is the 19th brightest star in our night sky and is the brightest star in the constellation Cygnus the swan. Deneb is one of the three bright stars of the “Summer Triangle” (along with Vega and Altair). Deneb is about 20 times more massive than our Sun but has used up its hydrogen, becoming a blue-white supergiant about 200 times the diameter of the Sun. If Deneb were where our Sun is, it would extend to about the orbit of the Earth. Deneb is about 2,600 light years from us.

As this lunar cycle progresses, Saturn and the background of stars will appear to shift westward each evening (as the Earth moves around the Sun). Bright Venus will shift to the left along the southwestern horizon in the opposite direction as the stars, passing above the bright star Antares (they will appear 3 degrees apart at their closest on October 25). October 21 will be the first evening the planet Mercury will be above the west-southwestern horizon 30 minutes after sunset (an estimate of when it will first be visible in the glow of dusk). The waxing Moon will pass by Antares on November 3, Venus on November 4, and Saturn on November 10. November 11 will be when Mercury will first appear above the horizon as twilight ends.

By the evening of Friday, November 15 (the evening of the full Moon after next), as twilight ends at 5:55 p.m. EST, the rising Moon will be 14 degrees above the east-northeastern horizon with the Pleiades star cluster 5 degrees to the lower left. The brightest planet in the sky will be Venus at 12 degrees above the southwestern horizon. Next in brightness will be Mercury at less than a degree above the west-southwestern horizon. Saturn will be 38 degrees above the south-southeastern horizon. Comet C/2023 A3 (Tsuchinshan-ATLAS) will be 39 degrees above the west-southwestern horizon, with its current brightness curve predicting it will have faded to magnitude 8, too faint to see with the unaided eye. The bright star closest to overhead will still be Deneb at 79 degrees above the northwestern horizon.

Morning Sky Highlights

On the morning of Thursday, October 17, 2024 (the morning of the full Moon), as twilight begins at 6:22 a.m. EDT, the setting Moon will be 11 degrees above the western horizon. The brightest planet in the sky will be Jupiter at 63 degrees above the west-southwestern horizon. Mars will be at 72 degrees above the south-southeastern horizon. Comet C/2024 S1 (ATLAS) will be 6 degrees above the east-southeastern horizon but will likely be too dim to be seen without a telescope (current projection, magnitude 12.7). The bright star appearing closest to overhead will be Pollux, the 17th brightest star in our night sky and the brighter of the twin stars in the constellation Gemini, at 75 degrees above the southeastern horizon. Pollux is an orange tinted star about 34 lightyears from Earth. It is not quite twice the mass of our Sun but about 9 times the diameter and 33 times the brightness.

As this lunar cycle progresses, Jupiter, Mars, and the background of stars will appear to shift westward each evening. Comet C/2024 S1 (ATLAS), visible with binoculars or a telescope, will brighten but shift lower as it races towards the Sun, with October 21 the last morning it will be above the horizon as morning twilight begins (estimated magnitude of 11.2). The waning Moon will pass by the Pleiades star cluster on October 19, Jupiter on October 21, Mars and Pollux on October 23, Regulus on October 26, and Spica on October 31. Comet C/2024 S1 (ATLAS) will pass its closest to the Sun on the morning of October 28 (when, if the sky is very clear, it might be bright enough to see in the daylight for an hour or so around 7:39 a.m.). If this comet survives its close pass by the Sun, it may reemerge in the morning sky. November 2 will be the first morning it will be above the horizon as morning twilight begins (with an estimated magnitude of 10.5, visible with binoculars or a telescope).

By the morning of Friday, November 15 (the morning of the full Moon after next), as twilight begins (at 5:51 a.m. EST), the setting full Moon will be 7 degrees above the west-northwestern horizon. The brightest planet in the sky will be Jupiter at 35 degrees above the western horizon. Mars will be at 68 degrees above the southwestern horizon. Comet C/2024 S1 (ATLAS) will be 13 degrees above the southeastern horizon (estimated magnitude 14.2). The bright star appearing closest to overhead will still be Pollux at 69 degrees above the west-southwestern horizon (higher than Mars by about a half degree).

Detailed Daily Guide

.Here for your reference is a day-by-day listing of celestial events between now and the full Moon on October 17, 2024. The times and angles are based on the location of NASA Headquarters in Washington, D.C, and some of these details may differ for where you are (I use parentheses to indicate times specific to the D.C. area). If your latitude is significantly different than 39 degrees north (and especially for my Southern Hemisphere readers), I recommend using an astronomy app or a star-watching guide from a local observatory, news outlet, or astronomy club.

Saturday morning, October 12: At 11:10 a.m. EDT, Comet C/2023 A3 (Tsuchinshan-ATLAS) will be at its closest to Earth. Although it will be on the horizon as evening twilight ends the evening before (Friday), it may be hard to see. Our first chance to see it above the horizon as evening twilight ends (at 7:31 PM) will likely be Saturday evening, when the comet will be 4 degrees above the western horizon, similar in altitude and to the right of Venus.

As of September 28 this comet is still following a brightness curve that predicts it to be quite bright near closest approach and remain visible to unaided human eyes (under clear dark sky conditions) through the end of October. How bright the comet will be and how quickly it actually dims will depend upon the gas and dust it is giving off, which can vary quickly and unpredictably, but it should be an impressive show in the evenings after October 12.

The comet will likely dim as it moves away from the Earth, but also appear higher in the sky and set later each evening, giving us more time and darker skies to look for it. As evening twilight ends on October 13 it will be 10 degrees above the western horizon, 12 degrees on October 14, 16 degrees on October 15, etc. Current brightness curves predict it will still be around magnitude 6 by the end of October (still visible to the unaided eye under good conditions).

Monday evening, October 14: The planet Saturn will appear near the waxing gibbous Moon. As evening twilight ends (at 7:28 p.m. EDT) Saturn will be 4 degrees to the upper right. The Moon will reach its highest for the night about 3.5 hours later (at 10:53 p.m.) with Saturn 5 degrees to the lower right. The pair will continue to separate, with Saturn setting first 5 hours after that (at 4:09 a.m.). For parts of Southern Asia and Africa the Moon will block Saturn from view.

Wednesday evening, October 16: At 8:57 p.m. EDT (CSG 8:47), the Moon will be at perigee, its closest to the Earth for this orbit.

As mentioned above, the full Moon will be Thursday morning, Oct. 17, at 7:26 a.m. EDT. This will be late Wednesday night for the International Date Line West time zone and early Friday morning from New Zealand Time eastwards to the International Date Line. This will be the third of four consecutive supermoons (and the brightest by a tiny margin). The Moon will appear full for about 3 days around this time, from Tuesday evening through Friday morning.

Saturday night into Sunday morning, October 19 to 20: The Pleiades star cluster will appear near the waning gibbous Moon. At moonrise (7:42 p.m. EDT) on the east-northeastern horizon the Pleiades will be 3 degrees to the upper right. By the time the Moon reaches its highest for the night at 3:28 a.m., the Pleiades will be 7 degrees to the lower right.

Sunday night into Monday morning, October 20 to 21: The planet Jupiter will appear near the waning gibbous Moon. As Jupiter rises on the east-northeastern horizon at 9:08 p.m. EDT, it will be 6 degrees to the lower right of the Moon. As the Moon reaches its highest in the sky at 4:29 a.m., Jupiter will be 6 degrees below the Moon, and it will be to the lower left by the time morning twilight begins at 6:26 a.m.

As mentioned above, the Orionid meteor shower will peak the early morning of Monday, October 21. Conditions are not good as moonlight will interfere with seeing these meteors, but if you happen to be out keep an eye on the sky, as you might see a meteor or two.

For the Washington DC area and similar latitudes, Monday morning, October 21: This will be the last morning Comet C/2024 S1 (ATLAS), visible with binoculars or a telescope (estimated magnitude 11.2), will be above the horizon as morning twilight begins (at 6:27 AM EDT) as it rushes towards its close passage by the Sun a week later.

Monday evening, October 21: This will be the first evening the planet Mercury will be above the west-southwestern horizon 30 minutes after sunset (an estimate of when it will start being visible in the glow of dusk).

Tuesday night into Wednesday morning, October 22 to 23: The waning gibbous Moon, the bright star Pollux, and the planet Mars will form a triangle in the night sky. As Pollux rises on the northeastern horizon at 11 p.m. EDT, it will be 8 degrees to the lower left of the Moon. Mars will rise below the Moon 30 minutes later at 11:30 p.m. As the Moon reaches its highest for the night and morning twilight begins at 6:28 a.m., Pollux will be 4 degrees to the upper left and Mars will be 7 degrees to the lower left of the Moon.

Thursday morning, October 24: The waning Moon will appear half-full as it reaches its last quarter at 4:03 a.m. EDT.

If you find you are having trouble waking up in late October and early November, the dark mornings may be the reason (or at least a plausible excuse). Since 2007 when Congress moved the start of Daylight Saving Time from the end of October to the beginning of November, the latest sunrises of the year have been in late October and early November. In 2024, for the Washington, D.C. area and similar latitudes, the time of sunrise (in EDT) from Thursday, October 24 to Saturday, November 2 will be later than the latest sunrise of winter at 7:27 a.m. EST on January 5.

In the evening sky during this lunar cycle the bright planet Venus will be shifting to the upper left along the southwestern horizon in the opposite direction as the background of stars.

Friday, October 25: This will be when Venus and the bright star Antares will pass at their closest, with Antares 3 degrees to the lower left of Venus.

Saturday morning, October 26: The bright star Regulus will appear below the waning crescent Moon. As Regulus rises on the east-northeastern horizon at 2:15 a.m. EDT, it will be 5 degrees below the Moon. Morning twilight will begin more than 4 hours later at 6:31 a.m. with Regulus 4 degrees to the lower right of the Moon.

Monday morning, October 28: At about 7:39 a.m. EDT, Comet C/2024 S1 (ATLAS) will pass its closest to the Sun. If the sky is very clear, it might be bright enough to see in the daylight for an hour or so around closest approach. For the Washington, D.C. area, closest approach will only be 7 minutes after sunrise, so our only chance of seeing this is if the sky on the east-southeastern horizon is unusually clear. The comet will be to the lower left of the Sun, and since the tail points away from the Sun, it may be hidden by the horizon until the comet rises higher in the sky. Europe, Africa, and South America are better positioned to look for this comet near the Sun. Be careful and plan ahead, as it may be difficult to find a location that has both a clear view to the right part of the east-southeastern horizon and a large overhanging object to block the Sun while allowing you to see to the lower left of the Sun.

Pay attention to the news as the predictions may change, but the brightness predictions I have as of writing this are that this comet will be brighter than magnitude -5 until 8:06 a.m. (when the Sun will be 5.6 degrees above the horizon). Magnitude -4 is generally considered the brightness limit for visibility of an object during the day, and the comet is predicted to be above this magnitude until 8:39 AM, but because it will be close to the Sun it is hard to say what the actual visibility limit will be, as the glare near the Sun depends on atmospheric conditions and can be quite bright.

Tuesday, October 29: At 6:51 p.m. EDT, the Moon will be at apogee, its farthest from the Earth for this orbit.

Thursday morning, October 31: You might be able to see the thin, waxing crescent Moon low on the east-southeastern horizon 3.5 degrees to the lower left of the bright star Spica. You will need to look for them in the glow of dawn, as the Moon will rise at 6:43 a.m. EDT 7 minutes after twilight begins at 6:36 a.m.

Thursday, October 31, is Halloween: We currently divide the year into four seasons based upon the solstices and equinoxes, with winter beginning on the winter solstice in December. This approximates winter as the quarter of the year with the coldest temperatures. Much of pre-Christian northern Europe celebrated “cross-quarter days” halfway between the solstices and equinoxes, and divided the seasons on these days. Using this older definition, winter was the quarter of the year with the shortest daily periods of daylight, with autumn ending and winter beginning on Samhain, traditionally celebrated on October 31st or November 1st (the middle of our fall). Our Halloween customs are thought to have come from these earlier celebrations of fall’s end and winter’s start.

Friday morning, November 1, at 8:47 AM EDT: This will be the new Moon, when the Moon passes between the Earth and the Sun and will not be visible from the Earth. This new Moon is considered the darkest night of the Hindu lunisolar calendar. Diwali or Divali, also known as Dipawali or Deepavali, is an important five or six day festival of lights centered on this new Moon, celebrated by Hindus and other faiths including Jains, Sikhs, and Newar Buddhists. The name comes from the row (avali) of clay lamps (deepa) celebrants light to symbolize the inner light that protects from spiritual darkness. Lakshmi Puja or Kali Puja, venerating the goddess of prosperity, Lakshmi, is the central day of the festival (November 1 this year). It is a public holiday in many countries with large Hindu, Sikh, and/or Jain populations, including Fiji, Guyana, India, Malaysia, Mauritius, Myanmar, Nepal, Pakistan, Singapore, Sri Lanka, Suriname, and Trinidad and Tobago.

The day of or the day after the New Moon: This marks the start of the new month for most lunisolar calendars. The tenth month of the Chinese year of the Dragon starts on Friday, November 1. Sundown on Friday, November 1, marks the start of Marcheshvan in the Hebrew calendar, a name often shortened to Cheshvan or Heshvan.

If Comet C/2024 S1 (ATLAS) survives its close pass by the Sun, Saturday, November 2, will be the first morning it will be above the horizon as morning twilight begins at 6:38 a.m. EDT, appearing with an estimated magnitude of 10.5 (only visible with binoculars or a telescope).

Because of Daylight Saving Time, Saturday morning, November 2, will be the latest sunrise of the year. Morning twilight will begin at 6:38 a.m. EDT, sunrise will be at 7:37 a.m., solar noon will be at 12:51 p.m. when the Sun will reach its maximum altitude of 35.1 degrees, sunset will be at 6:06 p.m., and evening twilight will end at 7:05 p.m.

In the Islamic calendar the months traditionally start with the first sighting of the waxing crescent Moon. Many Muslim communities now follow the Umm al-Qura Calendar of Saudi Arabia, which uses astronomical calculations to start months in a more predictable way. Using this calendar, sundown on Saturday, November 2, will probably mark the beginning of Jumādā al-ʾŪlā.

Early on Sunday morning, November 3: We “Fall Back” from 1:59 a.m. EDT to 1 a.m. EST. While most of us will be gaining an hour of sleep, if you want to do something for 2 hours but are only supposed to do it for one, consider doing it for the “clock hour” from 1 a.m. EDT to 2 a.m. EST. Be careful though, as about twice as many accidents tend to happen during this “clock hour” compared to other mornings of the year! Regardless, on Sunday morning you will need to reset any clocks that didn’t reset themselves! On Sunday, twilight will begin at 5:39 a.m. EST, sunrise will be at 6:38 a.m., solar noon will be at 11:51 a.m. when the Sun will reach its maximum altitude of 35.8 degrees, sunset will be at 5:05 p.m., and evening twilight will end at 6:04 p.m.

It may be difficult to see, but on Sunday evening, November 3, the bright star Antares will appear 2 degrees above the thin, waxing crescent Moon. You will need to look for the Moon in the glow of dusk as it will set on the southwestern horizon just 1 minute after evening twilight ends (at 6:04 p.m. EST).

Monday evening, November 4: The bright planet Venus will appear 4 degrees to the upper right of the thin, waxing crescent Moon. The Moon will be 6 degrees above the southwestern horizon as evening twilight ends at 6:03 p.m. EST, and will set first 46 minutes later at 6:49 p.m.

Tuesday morning, November 5: Two minor meteor showers, the Southern Taurids (peaking at 7 meteors per hour on November 5) and the Northern Taurids (peaking at 5 meteors per hour on November 12), overlap to produce their highest combined rate. Although the light of the waxing crescent Moon will not interfere, even this combined rate will be low enough to make seeing these meteors from urban areas difficult due to light pollution. Still, if you are out after midnight and the sky is clear, you might see a meteor or two.

Early Saturday morning, November 9: The Moon will appear half-full as it reaches its first quarter at 12:56 a.m. EST.

In the evenings during much of this lunar cycle, the planet Mercury will be shifting to the upper left along the southwestern horizon, moving in the opposite direction from the background of stars. On Saturday and Sunday evenings, November 9 and 10, Mercury and the bright star Antares will pass their closest, less than 2 degrees apart, with Antares to the lower left of Mercury. You will need to look low on the southwestern horizon while dusk is in the sky, as they both will have set by the time evening twilight ends.

Saturday evening into early Sunday morning, November 9 to 10: The planet Saturn will appear near the waxing gibbous Moon. As evening twilight ends at 5:58 p.m. EST, Saturn will be 2 degrees to the upper left. The Moon will reach its highest point for the night about 1 hour 45 minutes later at 7:43 p.m., with Saturn 1 degree to the upper left. For the Washington, D.C. area, Saturn will be at its closest, about 0.1 degree to the upper right of the Moon, at about 9:55 p.m. (times and angles will differ for different locations). For the southern tip if Florida and parts of the Caribbean, Central America, and Northwestern South America, the Moon will block Saturn from view. The Moon will continue passing by Saturn, with Saturn setting first on the western horizon a little less than 3.5 hours later at 1:19 a.m.

Monday evening, November 11: This will be the first evening that the planet Mercury will be above the west-southwestern horizon as evening twilight ends at 5:57 p.m. EST.

Thursday morning, November 14: At 6:18 EST, the Moon will be at perigee, its closest to the Earth for this orbit.

The full Moon after next will be Friday afternoon, November 15, 2024 at 4:29 PM EST. This will be early Saturday morning from Kamchatka and Fiji Time eastwards to the International Date Line. This will be the last of four consecutive supermoons. The Pleiades star cluster will appear near the full Moon. The Moon will appear full for about three days around this time, from a few hours before sunrise Thursday morning into a few hours before sunrise Sunday morning.

NASA astronauts Don Pettit and Matthew Dominick captured a supercharged, super-red aurora display from the International Space Station.

In honor of Hispanic Heritage Month, we recognize Hispanic astronauts who have flown in space. The table below lists these individuals of various nationalities who have made significant contributions to their space programs. The first Hispanic astronauts completed short flights to a Soviet space station and aboard the space shuttle. In the past 23 years, many more have completed flights to the International Space Station and contributed to its assembly, operations, and research activities.  

Table of Hispanic astronauts who have flown in space.

Arnaldo Tamayo Méndez of Cuba holds the title of the first person of Hispanic heritage to fly in space. He spent eight days aboard the Salyut-6 space station in September 1980 as part of the Soviet Union’s Interkosmos program to fly cosmonauts from friendly socialist countries. The first Hispanic to fly on the space shuttle, Payload Specialist Rodolfo Neri Vela of Mexico, also introduced tortillas to astronauts’ on board menus during his flight on STS-61B in November 1985. Tortillas continue to be a staple on the space station today, for everything from breakfast tacos, to burgers, sandwiches, and pizzas. Selected as an astronaut in 1980, Costa Rican-born Franklin R. Chang-Díaz holds the honor as the first Hispanic American in space. He flew in space a record-tying seven times, including one visit to the Russian space station Mir and one to the International Space Station.

Left: Portrait of Cuban cosmonaut Arnaldo Tamayo Méndez. Middle: Mexican payload specialist Rodolfo Neri Vela enjoys a trend-setting tortilla during the STS-61B mission. Right: Portrait of NASA astronaut Franklin R. Chang-Díaz.

Franklin R. Chang-Díaz

Chang-Díaz’s first flight, STS-61C aboard space shuttle Columbia, took place in January 1986, a six-day flight to deploy a communications satellite and to remotely observe Halley’s comet. The crew included two future NASA administrators, NASA astronauts Charles F. Bolden and U.S. Senator (D-FL) C. William “Bill” Nelson. The flight landed just 10 days before the tragic loss of space shuttle Challenger. His next mission, STS 34 aboard Atlantis, in October 1989 saw the deployment of the Galileo spacecraft to explore Jupiter with an orbiter and an atmospheric probe. Chang-Díaz launched on his third mission, STS 46 in July 1992, an eight-day flight aboard Atlantis to test fly the first Tethered Satellite System (TSS-1).

Left: Franklin R. Chang-Díaz, center, the first Hispanic American astronaut, with his fellow STS-61C crew members. Middle: Chang-Díaz, center, and the STS-34 crew. Right: Chang-Díaz, upper right, with the STS-46 crew.

Chang-Díaz returned to space for his fourth mission in January 1994 aboard Discovery. The eight-day STS-60 flight comprised the first flight in the Shuttle-Mir program, with Russian cosmonaut Sergey K. Krikalev a member of the crew. Chang-Díaz launched on his fifth flight in February 1996, the 16-day STS-75 mission aboard Columbia to refly the TSS. On his sixth mission in June 1998, the STS-91 crew docked Discovery with the Russian space station Mir and returned astronaut Andrew S.W. Thomas to earth, the final Shuttle-Mir mission.

Left: Franklin R. Chang-Díaz, lower left, with the STS-60 crew. Middle: Chang-Díaz, left, with his STS-75 crew mates. Right: Chang-Díaz, with the STS-91 and Mir 25 crews.

During his record-tying seventh trip into space, Chang-Díaz made his only visit to the space station. The main goals of Endeavour’s STS-111 mission in June 2002 included the exchange of the Expedition 4 and 5 crews and the resupply of the station using the Leonardo Multi-Purpose Logistics Module (MPLM). Two new research facilities rode in the MPLM, the fifth Expedite the Processing of Experiments to the Space Station (EXPRESS) rack and the Microgravity Sciences Glovebox. Chang-Díaz completed three spacewalks with his fellow mission specialist, French astronaut Philippe Perrin, to install the Mobile Base System portion of the Canadarm2’s remote manipulator system and perform maintenance tasks on the station.

Left: NASA astronaut Franklin R. Chang-Díaz, left of center, with his STS-111 crewmates and the Expedition 4 and 5 crews. Middle: Chang-Díaz during the first STS-111 spacewalk. Right: Chang-Díaz in Endeavour’s middeck following undocking from the space station.

Sidney M. Gutierrez

NASA selected New Mexico native Sidney M. Gutierrez as an astronaut in 1984. On his first mission in June 1991, he served as the pilot of Columbia on the STS-40 Spacelab Life Sciences-1 mission, a nine-day flight dedicated to investigating the responses of the human body to weightlessness. He also served as a test subject for several of the experiments. During his second mission in April 1994, Gutierrez served as the commander of STS-59, the Space Radar Laboratory-1 flight, an 11-day mission aboard Endeavour. The payload included a synthetic aperture imaging radar.

Left: NASA astronaut Sidney M. Gutierrez, center, with his STS-40 crew mates. Right: Gutierrez, center, with the STS-59 crew.

Ellen Ochoa

Selected as the first female Hispanic astronaut in 1990, Ellen Ochoa completed four spaceflights and then served as the first Hispanic director of NASA’s Johnson Space Center in Houston. On her first mission in April 1993, she served as a mission specialist on the nine-day STS-56 flight, the second Atmospheric Laboratory for Applications and Science (ATLAS) mission aboard Discovery. An accomplished flautist, she played her flute during the flight. On her second flight, STS-66 in March 1994, Ochoa flew aboard Atlantis and operated the experiments of the ATLAS-3 payload during the 11-day mission.

Left: Ellen Ochoa, top left, and the rest of the STS-56 crew. Middle: Ochoa plays the flute on Discovery’s flight deck. Right: Ochoa, top left, and the rest of the STS-66 crew.

Ochoa holds the distinction as the first Hispanic astronaut to visit the space station, making her first visit in May 1999 as a mission specialist aboard Discovery’s 10-day STS-96 mission. The goals of the mission – only the second shuttle flight to the station that, at the time, comprised only two modules – included the transfer of two tons of logistics to the station, launched inside a Spacehab double module, and the delivery of the Russian Strela cargo crane.

Left: The space station as seen from STS-96. Middle: NASA astronaut Ellen Ochoa, lower right, with the STS-96 crew in the Unity Node 1. Right: Ochoa, bottom, with fellow STS-96 crewmembers Julie Payette of the Canadian Space Agency in the Zarya module.

Ochoa returned to a much-enlarged space station aboard space shuttle Atlantis in April 2002 during the STS-110 mission that delivered the 13-ton S0 truss – the center segment section to which future truss segments were later attached. Ochoa operated the Space Station Remote Manipulator System (SSRMS), also known as Canadarm2, to lift the S0 truss from the shuttle’s payload bay and attach it atop the Destiny module. The S0 truss also contained the Mobile Transporter to allow the SSRMS to translate up and down the trusses. Ochoa was named as JSC’s deputy director in 2007, then as JSC’s first Hispanic director in 2013. She served in that position until her retirement from NASA in 2018.

Left: NASA astronaut Ellen Ochoa operating Canadarm2 in the Destiny module. Middle: The space station as seen from the departing STS-110, showing the S0 truss mounted on Destiny. Right: Portrait of Ochoa as director of NASA’s Johnson Space Center in Houston.

Michael E. Lopez-Alegria

NASA selected Michael E. “LA” Lopez-Alegria, born in Madrid, Spain, as an astronaut in 1992. On his first spaceflight, he served as a mission specialist on STS-73, the second flight of the United States Microgravity Laboratory. The 16-day mission aboard Columbia in October 1995 included 37 investigations supported by 11 facilities, with the seven-member crew working around the clock in two shifts in a Spacelab module.

Left: Michael E. Lopez-Alegria, center, with the rest of the STS-73 crew inside the Spacelab module. Right: Lopez-Alegria working on biological experiment in the Spacelab module.

Lopez-Alegria served as a mission specialist on STS-92 during his first visit to the space station. He and his six crewmates launched aboard Discovery in  October 2000, the 100th launch of the program and the last to visit an unoccupied station. At the time, the station comprised just three modules. During the mission, the STS-92 crew installed the Z1 truss atop the Unity module, four Control Moment Gyros, and the third Pressurized Mating Adaptor. The Z1 truss  enabled the addition of solar arrays and radiators on the subsequent assembly flight and also contained high-rate communications equipment including the first Space-to-Ground antenna. Lopez-Alegria participated in two of the mission’s four spacewalks with Peter J. “Jeff” Wisoff to complete the assembly tasks. During their last spacewalk, the two conducted the first flight evaluation at the station of the Simplified Aid for EVA Rescue (SAFER), a propulsive backpack to be used by astronauts should they become detached from the spacecraft. The STS-92 crew left the station ready for its first inhabitants, and indeed less than two weeks later, the first Expedition crew arrived to begin permanent residency in low Earth orbit.

Left: NASA astronaut Michael E. Lopez-Alegria working outside the space station during STS-92. Middle: Lopez-Alegria, left, tests the Simplified Aid for EVA Rescue as fellow NASA astronaut Peter J. “Jeff” Wisoff looks on. Right: The space station as seen from Discovery shortly after undocking, showing the Z1 Truss with the Space-to-Ground Antenna at top and the third Pressurized Mating Adaptor at bottom.

For his third flight into space, Lopez-Alegria returned to the station in November 2002 during the STS-113 mission, the facility now permanently occupied and having grown significantly in the intervening two years. The primary tasks for the STS-113 crew included adding the P1 truss on the station’s port side, installing the Crew Equipment Translation Aid (CETA) cart, and assisting in the exchange between the Expedition 5 and 6 crews. Lopez-Alegria and fellow STS-113 mission specialist John B. Harrington conducted three spacewalks to complete the installation of the P1 truss and the CETA cart. After STS-113, assembly of the station came to a temporary halt following the Feb. 1, 2003, Columbia accident, and the subsequent grounding of the space shuttle fleet. Flights did not resume until September 2006.

Left: NASA astronaut Michael E. Lopez-Alegria during the first STS-113 spacewalk.  Middle: Lopez-Alegria, second from right in the middle row, posing in the Destiny module with his STS-113 crewmates, as well as the Expedition 5 and 6 crews. Right: The space station as seen by the departing STS-113 crew, with the newly installed P1 truss visible at right.

Lopez-Alegria returned to the space station again shortly after assembly resumed. For his fourth spaceflight, he launched aboard Soyuz TMA9 in September 2006, from the Baikonur Cosmodrome in Kazakhstan,. Mikhail V. Tyurin of Roscosmos accompanied him during the 215-day mission, to that time the longest space station expedition, was Mikhail V. Tyurin of Roscosmos. European Space Agency (ESA) astronaut Thomas A. Reiter, onboard the station since July 2006, became part of the Expedition 14 crew. As Commander of Expedition 14, Lopez-Alegria oversaw one of the most complex set of activities in the assembly of the station – the reconfiguration of its power and cooling systems. A week before his arrival, the STS-115 mission had delivered the second set of solar arrays to the station as part of the P3/P4 truss segment, positioning them outboard of the P1 segment. As part of the reconfiguration, the port side P6 array mounted atop the Z1 truss needed to be retracted to prevent interference with the rotation of the new arrays, a task that was completed during the visiting STS-116 mission in December that also added the P5 short spacer to the port side truss. That mission brought NASA astronaut Sunita L. “Suni” Williams to the station as a new addition to Expedition 14 and returned Reiter back to Earth. During Expedition 14, Lopez-Alegria took part in five spacewalks, two in Orlan spacesuits with Tyurin to conduct work on the outside of the Russian segment and three in American spacesuits, with Williams to reconfigure the cooling system of the U.S. segment. He accumulated a total of 67 hours and 40 minutes over 10 spacewalks – still the record among American astronauts. Lopez-Alegria also conducted a variety of scientific experiments.

Left: Space station configuration when NASA astronaut Michael E. Lopez-Alegria arrived in September 2006. Middle: Lopez-Alegria, back row middle, with STS-116 and Expedition 14 crew members. Right: Celebrating the holidays aboard the space station.

Left: NASA astronaut Michael E. Lopez-Alegria conducting a session of the Canadian TRAC experiment in the Destiny module. Middle: In an Orlan suit, Lopez-Alegria conducts maintenance on the exterior of the Russian segment. Right: The space station’s configuration at the end of Lopez-Alegria’s mission – note the retracted P6 solar array.

Lopez-Alegria retired from NASA in 2012, joining Axiom Space shortly thereafter. In April 2022, he commanded the Ax-1 mission, the first commercial astronaut mission to the space station. He and his three crewmates spent 17 days aboard, conducting a variety of experiments. Lopez-Alegria returned to space as commander of the Ax-3 mission in January 2024. He and his three multi-national crewmates spent 22 days aboard the space station conducting numerous experiments. Across his six missions, Lopez-Alegria accumulated a total of 297 days in space.

Left: Axiom Space astronaut Michael E. Lopez-Alegria floats into the space station during the Ax-1 mission.
Middle: Lopez-Alegria, second from right, and the rest of the Ax-1 crew. Right: The 11 crew members
aboard the space station during the Ax-1 mission, with Lopez-Alegria at far right.

Left: Axiom Space astronaut Michael E. Lopez-Alegria answers questions from the space station’s Cupola during the Ax-3 mission. Middle: Lopez-Alegria, second from left, and the rest of the Ax-3 crew. Right: The 11 members of the Expedition 70 and Ax-3 crews, with Lopez-Alegria at far left.

Carlos I. Noriega

In 1994, NASA selected Carlos I. Noriega as the first Peruvian-born astronaut. On his first spaceflight in May 1997, he served as a mission specialist aboard STS-84, the sixth Shuttle-Mir docking mission. During the nine-day flight, the crew resupplied the Mir space station, brought NASA astronaut C. Michael Foale to the Russian outpost, and returned Jerry M. Linenger to Earth.

Left: Carlos I. Noriega sets up an experiment during the STS-84 mission. Middle: Noriega working on an experiment in the Spacecab module. Right: The 10 members of the STS-84 and Mir resident crew, with Noriega at upper right.

In December 2000, Noriega launched on his second mission, aboard Endeavour with his four crewmates on STS-97, their primary goal to install the P6 truss segment with the first set of solar arrays and radiators atop the Z1 truss. STS-97 marked the first time a shuttle visited the station after its occupancy began, but given the busy spacewalk schedule, the hatches between the two vehicles were only open for 24 hours. Noriega and fellow mission specialist Joseph R. Tanner conducted three spacewalks to complete the P6 installation and other assembly tasks. The new solar arrays generated enough power for the arrival of the U.S. laboratory module Destiny early in 2001 and the start of intensive research aboard the space station.

Left: NASA astronaut Carlos I. Noriega waves to the camera as he installs the P6 truss and solar arrays. Middle: Noriega, center, with the STS-97 and Expedition 1 crews in the Zarya Service Module. Right: The space station as seen from the departing STS-97 showing the newly deployed P6 solar arrays.

Pedro Duque

The European Space Agency (ESA) selected Pedro Duque, born in Madrid, Spain, as an astronaut in 1992. Four years later, he joined NASA’s astronaut class of 1996 in training and two years later certified as a mission specialist. His first launch into space took place in October 1998 on Discovery’s STS-95 mission, the nine-day flight that saw astronaut John H. Glenn’s return to space. Duque returned to space in October 2003 aboard Soyuz TMA3, conducting experiments aboard the space station as part of his Cervantes visiting mission. He returned to Earth 10 days later aboard Soyuz TMA2.

Left: Spanish astronaut Pedro Duque, lower left, representing the European Space Agency, with his STS-95 crewmates. Middle: Duque conducting an experiment in the Microgravity Science Glovebox aboard the space station. Right: Duque, center, with his Expedition 7 and 8 crewmates.

Marcos C. Pontes

The Brazilian Space Agency selected Marcos C. Pontes as an astronaut in 1998. He trained with NASA’s astronaut class of 1998 and certified as a mission specialist two years later. Pontes made his one and only spaceflight in March 2006 aboard Soyuz TMA8, carrying out eight experiments. He returned to Earth 10 days later aboard Soyuz TMA7.

Left: Brazilian astronaut Marcos Pontes, center at rear, with his Expedition 12 and 13 crewmates. Middle: Pontes works on an experiment in the Destiny Laboratory Module. Right: Pontes at work on an experiment in the Russian Zvezda module.

John D. “Danny” Olivas

Selected as a member of NASA’s Astronaut Class of 1998, John D. “Danny” Olivas visited the space station on two occasions as a shuttle mission specialist. His first visit took place aboard Atlantis during the STS-117 mission in June 2007. During the flight, Olivas and fellow mission specialist James F. Reilly conducted two of the four spacewalks to install the S3/S4 truss segment that included the third set of solar arrays. To prevent interfering with the rotation of the new arrays, the crew retracted the starboard P6 array mounted atop the Z1 truss. The STS-117 mission also served as a crew exchange flight, with NASA astronaut Clayton C. Anderson replacing Suni Williams as a member of Expedition 15.

Left: NASA astronaut John D. “Danny” Olivas during an STS-117 spacewalk working on the S3/S4 truss installation. Middle: Olivas, back row at right, with the STS-117 and Expedition 15 crews. Right: The space station as seen by the departing STS-117 crew, showing the new set of starboard solar arrays at right.

On his return to the station, Olivas found it a bit more crowded – three months earlier, the permanent crew aboard the station had expanded from three to six. He and his crewmates launched aboard Discovery on the STS-128 mission in August 2009. The shuttle’s payload bay contained the Leonardo MPLM bringing supplies to help maintain a 6-person crew on the space station, including three systems racks: a crew quarters, an Air Revitalization System  rack, and the Combined Operational Load Bearing External Resistance Treadmill (COLBERT) for crew exercise – as well as three research racks – the Fluid Integrated Rack , the Materials Science Research Rack, and the second Minus Eighty-degree Laboratory Freezer for ISS (MELFI). Olivas participated in three spacewalks to replace the Ammonia Tank Assembly  on the P1 truss and to retrieve two experiments from the European Columbus module’s External Payload Facility. STS-128 also completed the final shuttle-based crew exchange, with NASA astronauts Nicole P. Stott and Timothy L. Kopra exchanging places as Expedition 20 crewmembers.

Left:NASA astronaut John D. “Danny” Olivas poses during spacewalk work on the Ammonia Tank Assembly. Middle: Olivas eating a chocolate and peanut butter snack. Right: Olivas, at center, with the STS-128 and Expedition 20 crews.

George D. Zamka

Selected as a NASA astronaut in 1998, George D. Zamka completed his first space flight as pilot on Discovery’s STS-120 mission. Launching in October 2007, Zamka and his crewmates brought the Harmony Node 2 module to the station, temporarily berthing it on the Unity Node 1’s port side until the Expedition 16 crew relocated it to Destiny’s forward hatch. In its final location, Harmony enabled the later installation of the European and Japanese elements. The crew also relocated the P6 truss segment from atop Z1 to the outboard port truss. During the redeployment of the P6 solar arrays, one of the arrays developed a tear that required repair using a cufflink-like device to sew up the gap in the panel. STS-120 also conducted a crew exchange, with NASA astronauts Daniel M. Tani and Clay Anderson exchanging places as members of Expedition 16. As the STS-120 pilot, Zamka completed the undocking from the station and the departure fly-around maneuver.

Left: NASA astronaut George D. Zamka holding the cufflink device used to repair the torn solar array. Middle: Zamka, lower right, with the STS-120 and Expedition 16 crews. Right: The space station as seen from STS-120 departing, showing the newly delivered Harmony Node 2 module temporarily berthed at the Unity Node 1 and the relocated and redeployed P6 truss segment and solar arrays at left.

When he returned to the orbiting lab in February 2010, Zamka did so as commander of space shuttle Endeavour’s STS-130 mission. After guiding the shuttle to a successful docking with the station, Zamka and his crewmates, along with the Expedition 22 crew, installed the Tranquility Node 3 module to Unity’s port side and activated the new element. The new module provided accommodations for life support and habitation facilities for the station’s six-person crew. The crew removed the Cupola from its launch position at the end of Tranquility and relocated it to the module’s Earth-facing port. The Cupola’s six trapezoidal and one circular center window provide crews not only visibility for approaching visiting vehicles, but also spectacular views of their home planet passing by below. 

Left: NASA astronaut George D. Zamka peering through one of the Cupola’s windows. Middle: Zamka, front row second from right, with the STS-130 and Expedition 22 crews. Right: The space station as seem from the departing STS-130, showing the Tranquility Node 3 and Cupola berthed at the Unity Node 1, left of center.

Joseph M. “Joe” Acaba

Joseph M. “Joe” Acaba was selected in 2004 as part of NASA’s Educator Astronaut Program and qualified as a mission specialist. His first flight into space was aboard STS-119 in March 2009. Discovery brought up the S6 final truss segment with the fourth and final set of solar arrays, bringing the U.S. segment of the station’s useable power generating capability between 42 and 60 kilowatts. Acaba completed two of the mission’s three spacewalks, one with fellow mission specialist Steven R. Swanson and the other with fellow educator-astronaut and mission specialist Richard R. “Ricky” Arnold. During the STS-119 mission, Koichi Wakata of the Japan Aerospace Exploration Agency (JAXA) replaced NASA astronaut Sandra H. Magnus as a member of the Expedition 18 crew.

Left: NASA astronaut Joseph M. Acaba during the third STS-119 spacewalk. Middle: Acaba, front row at right, with the STS-119 and Expedition 18 crews. Right: The space station as seen from the departing STS-119, with the newly added S6 truss segment and solar arrays, at right.

For his second visit to the station, Acaba stayed for 125 days as part of Expeditions 31 and 32, launching in May 2012 from Kazakhstan aboard Soyuz TMA-04M. A week after arriving, Acaba and his crewmates welcomed the first commercial vehicle to dock with the space station, the SpaceX Dragon cargo resupply vehicle on its Demo-2 mission carrying food, water, scientific experiments and other supplies. The Expedition 31 crew loaded the Dragon spacecraft with cargo and experiment samples for return to Earth. The crew observed and photographed a rare celestial event, a transit of Venus across the Sun on June 5. In addition to conducting numerous science experiments, Acaba helped fire prevention icon Smokey the Bear celebrate his 68th birthday.

Left: NASA astronaut Joseph M. Acaba, top right, with his Expedition 31 crewmates inside the SpaceX Dragon resupply vehicle. Middle: Acaba running on the COLBERT treadmill. Right: Acaba refracted in a globule of water.

Left: NASA astronaut Joseph M. Acaba, right, drawing a blood sample from Akihiko Hoshide of the Japan Aerospace Exploration Agency. Middle: Acaba with a toy Smokey the Bear in the Cupola to help celebrate the forest fire prevention icon’s 68th birthday. Right: Acaba, lower right, with this Expedition 32 crewmates.

Acaba returned to the space station five years later as a member of Expedition 53 and 54, launching in September 2017, aboard Soyuz MS-06 Acaba joined NASA astronaut Randolph J. “Randy” Bresnik for a nearly seven-hour spacewalk to lubricate the newly installed replacement Latching End Effector on the SSRMS. Acaba continued with the research program and celebrated his Puerto Rican heritage with several events. He returned to Earth after a 168-day flight. Over his three missions, Acaba accumulated 306 days in space and nearly 20 hours in spacewalk time. Since February 2023, he has served as the chief of the astronaut office.

Left: NASA astronaut Joseph M. Acaba conducting an experiment in the Microgravity Sciences Glovebox. Middle left: In the Cupola, Acaba showing Puerto Rico pride. Middle right: During a spacewalk, Acaba is lubricating the Candarm2 Latching End Effector. Right: Acaba, left, with his Expedition 53 crewmates.

Left: NASA astronaut Joseph M. Acaba working with the Biological Research in Canisters experiment. Middle left: Acaba speaking with the Puerto Rico Institute of Robotics. Middle right: During the holidays, Acaba participating in a parranda by video. Right: Acaba, upper left, with his Expedition 54 crewmates.

José M. Hernández

Selected in 2004 as a NASA astronaut, José M. Hernández made his single visit to the space station during the STS-128 mission. Launched aboard space shuttle Discovery in August 2009, Hernández operated both the shuttle and station robotic arms to move the Leonardo MPLM back and forth and translate astronauts during the mission’s three spacewalks. He participated in the transfer and installation of the three systems racks and the three research racks aboard the orbiting laboratory. STS-128 also completed the final shuttle-based crew exchange, with Stott replacing Kopra as an Expedition 20 crew member. In collaboration with Amazon Studios, NASA is helping chronicle Hernández’ life and career through the film “A Million Miles Away,” telling the story of his journey from migrant farmer to NASA space explorer.

Left:  NASA astronaut José M. Hernández operating the shuttle’s robotic arm to transfer the Leonardo Multipurpose Logistics Module (MPLM) to the station. Middle: Hernández operating the station’s robotic arm to return the MPLM to the shuttle’s payload bay. Right: Hernández, front row center, with the STS-128 and Expedition 20 crews.

Serena M. Auñón-Chancellor

Serena M. Auñón-Chancellor was selected as a member of NASA’s Astronaut Class of 2009 and made her first spaceflight nine years later. She launched aboard Soyuz MS-09 in June 2018and began work on the more than 300 research investigations she carried out during her stay aboard the orbiting laboratory. Auñón-Chancellor returned to Earth after completing a 197-day flight.

Left: NASA astronaut Serena M. Auñón-Chancellor conducting the AngieX Cancer Therapy experiment in the Microgravity Sciences Glovebox. Middle: Auñón-Chancellor completing a session of the Eye Exam – Fundoscope experiment to help understand vision changes in microgravity. Right: Auñón-Chancellor, top, posing with her Expedition 56 crewmates in the Harmony Node 2 module.

Left: NASA astronaut Serena M. Auñón-Chancellor working on the BioServe Protein Crystalography-1 experiment. Middle: Expedition 57 crew members in their best Halloween outfits – Sergei V. Prokopiev of Roscosmos, left, as Elvis, ESA astronaut Alexander Gerst as Darth Vader, and Auñón-Chancellor as a mad scientist. Right: Auñón-Chancellor and her Expedition 57 crewmates in the Destiny module.

Francisco “Frank” C. Rubio

Selected as an astronaut by NASA in 2017, Dr. Francisco “Frank” C. Rubio began his first trip to space in September 2022, with Russian cosmonauts Sergei V. Prokopyev and Dmitri A. Petelin aboard Soyuz MS-22, for a planned six-month stay aboard the space station. A leak aboard their Soyuz MS-22 spacecraft in December resulted in the loss of its coolant, and they could no longer rely on it to return to Earth. Roscosmos sent the replacement Soyuz MS-23 to the station in February 2023. The incident extended their mission to over one year. On Sept. 11, Rubio broke the record of 355 days for the longest single flight by an American astronaut, set by Mark T. Vande Hei in March 2022. Prokopyev, Petelin, and Rubio landed on Sept. 27 after a 371-day flight, the longest aboard the space station up to that time.

Left: Shortly after arriving at the space station, NASA astronaut Francisco “Frank” C. Rubio receives his gold astronaut pin from Japan Aerospace Exploration Agency astronaut and fellow Expedition 68 crew member Koichi Wakata. Middle: Rubio during one of his two spacewalks. Right: Rubio, left, with Russian cosmonauts Sergey V. Prokopyev and Dmitri A. Petelin with a cake with “356” written on it to signify they surpassed the previous record of 355 days as the longest flight aboard the space station up to that time.

To be continued…

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Members of NASA’s SpaceX Crew-8 mission from right to left, NASA astronauts Jeanette Epps, mission specialist; Matthew Dominick, commander; Michael Barratt, pilot; and Roscosmos cosmonaut Alexander Grebenkin, mission specialist; participate in the Crew Equipment Interface Test at Cape Canaveral Space Force Station in Florida on Friday, Jan. 12, 2024. SpaceX

NASA and SpaceX are targeting no earlier than 7:05 a.m. EDT Sunday, Oct. 13, for the agency’s SpaceX Crew-8 mission to undock from the International Space Station. Pending weather conditions, the earliest splashdown time is targeted for 3:38 p.m. Monday, Oct. 14, at one of the multiple zones available off the coast of Florida.

NASA astronauts Matthew Dominick, Michael Barratt, and Jeanette Epps, and Roscosmos cosmonaut Alexander Grebenkin, are completing a seven-month science expedition aboard the orbiting laboratory and will return important and time-sensitive research to Earth.

Mission managers continue monitoring weather conditions in the area, as Dragon’s undocking depends on various factors, including spacecraft readiness, recovery team readiness, weather, sea states, and other factors. NASA will select a specific splashdown time and location closer to the Crew-8 spacecraft undocking.

Watch Crew-8 return activities on NASA+. Learn how to stream NASA content through a variety of additional platforms, including social media. For schedule information, visit:

https://www.nasa.gov/live

For the planned Oct. 13 undocking, NASA’s live return operations coverage is as follows (all times Eastern and subject to change based on real-time operations):

Sunday, Oct. 13

5 a.m. – Hatch closure coverage begins on NASA+

5:30 a.m. – Hatch closing

6:45 a.m. – Undocking coverage begins on NASA+

7:05 a.m. – Undocking

Following the conclusion of undocking, NASA coverage will switch to audio only.

Pending weather conditions at the splashdown sites, continuous coverage will resume Oct. 14, on NASA+ prior to the start of deorbit burn.

Monday, Oct. 14

2:30 p.m. – Return coverage begins on NASA+

2:53 p.m. – Deorbit burn (time is approximate)

3:38 p.m. – Splashdown (time is approximate)

5:15 p.m. – Return to Earth media teleconference with the following participants:

• Richard Jones, deputy manager, NASA’s Commercial Crew Program
• Bill Spetch, operations and integration manager, NASA’s International Space Station Program
• William Gerstenmaier, vice president, Build & Flight Reliability, SpaceX

To participate in the teleconference, media must contact the NASA Johnson newsroom by 3 p.m. Oct. 14 at: jsccommu@mail.nasa.gov or 281-483-5111. To ask questions, media must dial in no later than 10 minutes before the start of the call. The agency’s media credentialing policy is available online.

Find full mission coverage, NASA’s commercial crew blog, and more information about the Crew-8 mission at:

https://www.nasa.gov/commercialcrew

-end-

Jimi Russell / Claire O’Shea
Headquarters, Washington
202-358-1100
james.j.russell@nasa.gov / claire.a.o’shea@nasa.gov

Raegan Scharfetter / Sandra Jones
Johnson Space Center, Houston
281-483-5111
raegan.r.scharfetter@nasa.gov / sandra.p.jones@nasa.gov

Steve Siceloff / Danielle Sempsrott
Kennedy Space Center, Fla.
321-867-2468
steven.p.siceloff@nasa.gov / danielle.c.sempsrott@nasa.gov

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Details Last Updated Oct 11, 2024 LocationKennedy Space Center Related Terms

• Humans in Space
• Astronauts
• Commercial Space
• International Space Station (ISS)
• ISS Research
• Missions

Comet C/2023 A3 (Tsuchinshan-ATLAS) was about 44 million miles away from Earth in this photograph from the International Space Station as it orbited 272 miles above the South Pacific Ocean southeast of New Zealand just before sunrise on Sept. 28, 2024.

NASA/Matthew Dominick

NASA astronaut Matthew Dominick captured this timelapse photo of Comet C/2023 A3 (Tsuchinshan-ATLAS) from the International Space Station as it orbited 272 miles above the South Pacific Ocean southeast of New Zealand just before sunrise on Sept. 28, 2024. At the time, the comet was about 44 million miles away from Earth.

Though the comet is very old, it was just discovered in 2023, when it approached the inner solar system on its highly elliptical orbit for the first time in documented human history. Beginning in mid-October 2024, Comet C/2023 A3 (Tsuchinshan-ATLAS) will become visible low in the west following sunset. If the comet’s tail is well-illuminated by sunlight, it could be visible to the unaided eye. Oct. 14-24 is the best time to observe, using binoculars or a small telescope.

The comet hails from the Oort Cloud, which scientists think is a giant spherical shell surrounding our solar system. It is like a big, thick-walled bubble made of icy pieces of space debris the sizes of mountains and sometimes larger. The Oort Cloud lies far beyond Pluto and the most distant edges of the Kuiper Belt and may contain billions, or even trillions, of objects.

Image Credit: NASA/Matthew Dominick