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6 Things to Know From NASA About New US, European Sea Satellite
6 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater) Set to launch no earlier than Nov. 16, Sentinel-6B will continue a decades-long data record of sea level measurement that will help decision-makers manage coastal flooding, support hurricane intensity forecasts, and assist in the return of astronauts from space.NASA
Data from Sentinel-6B will continue a decades-long record of sea surface height, helping to improve coastal planning, protect critical infrastructure, and advance weather forecasts.
With launch set for no earlier than 12:21 a.m. EST Monday, Nov. 17, Sentinel-6B is the latest satellite in a series of spacecraft NASA and its partners have used to measure sea levels since 1992. Their data has helped meteorologists improve hurricane forecasts, managers protect infrastructure, and coastal communities plan.
After launch, Sentinel-6B will begin the process of data cross-calibration with its predecessor, Sentinel-6 Michael Freilich, to provide essential information about Earth’s ocean.
Sentinel-6B is the second of two satellites that constitute the Sentinel-6/Jason-CS (Continuity of Service) mission, a collaboration between NASA, ESA (European Space Agency), EUMETSAT (European Organisation for the Exploitation of Meteorological Satellites), and the National Oceanic and Atmospheric Administration (NOAA). The European Commission contributed funding support while France’s space agency CNES (Centre National d’Études Spatiales) provided technical expertise.
Here are six things to know about Sentinel-6B and the broader Copernicus Sentinel-6/Jason-CS mission:
1. Sentinel-6B will deliver data on about 90% of Earth’s ocean, providing direct benefits to humanity.
Sentinel-6B will contribute to a multidecade dataset for sea level measurements from space. This data is key to helping improve public safety, city planning, and protecting commercial and defense interests.
Pioneered by NASA and its partners, the dataset enables users in government, industry, and the research community to better understand how sea levels change over time. Combined with information from other NASA satellites, data from Copernicus Sentinel-6/Jason-CS is vital for tracking how heat and energy move through Earth’s seas and atmosphere, as well as for monitoring ocean features such as currents and eddies. The measurements come courtesy of a radar altimeter that measures sea levels for nearly all of Earth’s ocean, providing information on large-scale currents that can aid in commercial and naval navigation, search and rescue, and the tracking of debris and pollutants from disasters at sea.
Sentinel-6B is part of a U.S.-European mission that will continue 30-year-plus record of sea-level measurements. Its observations will help build an accurate picture of local and global sea surface heights to support storm forecasting, secure coastal infrastructure, and help optimize commercial activities, such as shipping.Credit: NASA/JPL-Caltech
2. Data from the Copernicus Sentinel-6/Jason-CS mission helps NASA prepare for the next phase of space exploration.
The better we understand Earth, the better NASA can carry out its mission to explore the universe. Data from the Copernicus Sentinel-6/Jason-CS mission is used to refine the Goddard Earth Observing System atmospheric forecast models, which the NASA Engineering Safety Center uses to plan safer reentry of astronauts returning from Artemis missions.
Additionally, changes to Earth’s ocean, observed by satellites, can have measurable effects beyond our planet. For instance, while the Moon influences ocean tides on Earth, changes in those tides can also exert a small influence on the Moon. Data from Copernicus Sentinel-6/Jason-CS can help improve understanding of this relationship, knowledge that can contribute to future lunar exploration missions.
3. The Copernicus Sentinel-6/Jason-CS mission helps the U.S. respond to challenges by putting actionable information into the hands of decision-makers.
Data collected by the mission helps city planners, as well as local and state governments, to make informed decisions on protecting coastal infrastructure, real estate, and energy facilities. The mission’s sea level data also improves meteorologists’ weather predictions, which are critical to commercial and recreational navigation. By enhancing weather prediction models, data provided by Copernicus Sentinel-6/Jason-CS improves forecasts of hurricane development, including the likelihood of storm intensification, which can aid disaster preparedness and response.
Get the Sentinel-6B Press Kit4. Data from Sentinel-6B will support national security efforts.
The ocean and atmosphere measurements from Sentinel-6B will enable decision-makers to better protect coastal military installations from such events as nuisance flooding while aiding national defense efforts by providing crucial information about weather and ocean conditions. The satellite will do so by feeding near-real time data on Earth’s atmosphere and seas to forward-looking weather and ocean models. Since the measurements are part of a long-term dataset, they also can add historical context that puts the new data in perspective.
5. The Copernicus Sentinel-6/Jason-CS mission’s direct observation of sea levels delivers information critical to protecting coastlines, where nearly half of the world’s population lives.
Sea level rise varies from one area to another, meaning that some coastlines are more vulnerable than others to flooding, erosion, and saltwater contamination of underground freshwater supplies, the latter of which threatens farmland and drinking water. Sea level measurements from Sentinel-6 Michael Freilich, and soon, Sentinel-6B, form the basis of U.S. flood predictions for coastal infrastructure, real estate, energy storage sites, and other coastal assets. Knowing which regions are more vulnerable to these risks will enable U.S. industries and emergency managers to make better-informed decisions about transportation and commercial infrastructure, land-use planning, water management, and adaptation strategies.
6. The international collaboration behind the mission enables the pooling of capabilities, resources, and expertise.
The multidecadal dataset that this mission supports is the result of years of close work between NASA and several collaborators, including NASA, ESA, EUMETSAT, CNES, and NOAA. By pooling expertise and resources, this partnership has delivered cost-effective solutions that have made precise, high-impact data available to industry and government agencies alike.
More about Sentinel-6B
Copernicus Sentinel-6/Jason-CS was jointly developed by ESA, EUMETSAT, NASA, and NOAA, with funding support from the European Commission and technical support from CNES. The mission also marks the first international involvement in Copernicus, the European Union’s Earth Observation Programme.
Managed for NASA by Caltech in Pasadena, JPL contributed three science instruments for each Sentinel-6 satellite: the Advanced Microwave Radiometer, the Global Navigation Satellite System – Radio Occultation, and the laser retroreflector array. NASA is also contributing launch services, ground systems supporting operation of the NASA science instruments, the science data processors for two of these instruments, and support for the international ocean surface topography community.
For more about Sentinel-6B, visit:
https://science.nasa.gov/mission/sentinel-6B
How Sentinel-6B Will Help Ships at Sea How Sentinel-6B Will Help Improve Hurricane Forecasts How Do We Measure Sea Level?News Media Contacts
Elizabeth Vlock
NASA Headquarters, Washington
202-358-1600
elizabeth.a.vlock@nasa.gov
Andrew Wang / Andrew Good
Jet Propulsion Laboratory, Pasadena, Calif.
626-379-6874 / 626-840-4291
andrew.wang@jpl.nasa.gov / andrew.c.good@jpl.nasa.gov
2025-124
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NASA Sets Launch Coverage for International Ocean Tracking Mission
NASA will provide live coverage of prelaunch and launch activities for Sentinel-6B, an international mission delivering critical sea level and ocean data to protect coastal infrastructure, improve weather forecasting, and support commercial activities at sea.
Launch is targeted at 12:21 a.m. EST, Monday, Nov. 17 (9:21 p.m. PST, Sunday, Nov. 16) aboard a SpaceX Falcon 9 rocket from Space Launch Complex 4 East at Vandenberg Space Force Base in California.
Watch coverage beginning at 11:30 p.m. EST (8:30 p.m. PST) on NASA+, Amazon Prime, and more. Learn how to watch NASA content through a variety of platforms, including social media.
The Sentinel-6B mission continues a decades-long effort to monitor global sea level and ocean conditions using precise radar measurements from space. Since the early 1990s, satellites launched by NASA and domestic and international partners have collected precise sea level data. The launch of Sentinel-6B will extend this dataset out to nearly four decades.
NASA’s mission coverage is as follows (all times Eastern and subject to change based on real-time operations):
Saturday, Nov. 15
4 p.m. – NASA Prelaunch Teleconference on International Ocean Tracking Mission
- Karen St. Germain, director, Earth Science Division, NASA Headquarters in Washington
- Pierrik Veuilleumier, Sentinel-6B project manager, ESA (European Space Agency)
- Parag Vaze, Sentinel-6B project manager, NASA’s Jet Propulsion Laboratory in Pasadena, California
- Tim Dunn, senior launch director, Launch Services Program, NASA’s Kennedy Space Center in Florida
- Julianna Scheiman, director, NASA Science Missions, SpaceX
- 1st Lt. William Harbin, launch weather officer, U.S. Air Force
Audio of the teleconference will stream on the NASA Video YouTube channel.
Media interested in participating by phone must RSVP no later than two hours prior to the start of the call at: ksc-newsroom@mail.nasa.gov. A copy of NASA’s media accreditation policy is online.
Sunday Nov. 16
11:30 p.m. – Launch coverage begins on NASA+, Amazon Prime, and more.
Audio-only coverage
Audio-only of the launch coverage will be carried on the NASA “V” circuits, which may be accessed by dialing 321-867-1220 or -1240. On launch day, “mission audio” countdown activities without NASA+ launch commentary will be carried at 321-867-7135.
NASA website launch coverage
Launch day coverage of the mission will be available on the agency’s website. Coverage will include links to live streaming and blog updates beginning no earlier than 11 p.m. EST, Nov. 16, as the countdown milestones occur. Streaming video and photos of the launch will be accessible on demand shortly after liftoff. Follow countdown coverage on NASA’s Sentinel-6/Jason-CS blog.
For questions about countdown coverage, contact the NASA Kennedy newsroom at: 321-867-2468.
Attend launch virtually
Members of the public can register to attend this launch virtually. NASA’s virtual guest program for this mission includes curated launch resources, notifications about related opportunities or changes, and a stamp for the NASA virtual guest passport following launch.
Watch, engage on social media
Let people know you’re watching the mission on X, Facebook, and Instagram by following and tagging these accounts:
X: @NASA, @NASAKennedy, @NASAJPL, @NASAEarth
Facebook: NASA, NASA Kennedy, NASA JPL, NASA Earth
Instagram: @NASA, @NASAKennedy, @NASAJPL, @NASAEarth
Sentinel-6B is the second of twin satellites in the Copernicus Sentinel-6/Jason-CS (Continuity of Service) mission, a collaboration among NASA, ESA, EUMETSAT (European Organisation for the Exploitation of Meteorological Satellites), and the National Oceanic and Atmospheric Administration (NOAA). The first satellite in the mission, Sentinel-6 Michael Freilich, launched in November 2020. The European Commission contributed funding support, while France’s space agency CNES (Centre National d’Études Spatiales) provided technical expertise. The mission also marks the first international involvement in Copernicus, the European Union’s Earth Observation Programme.
For more information about these missions, visit:
https://science.nasa.gov/mission/sentinel-6b/
-end-
Elizabeth Vlock
NASA Headquarters, Washington
202-358-1600
elizabeth.a.vlock@nasa.gov
Leejay Lockhart
Kennedy Space Center, Fla.
321-747-8310
leejay.lockhart@nasa.gov
Andrew Wang / Andrew Good
Jet Propulsion Laboratory, Pasadena, Calif.
626-379-6874 / 818-393-2433
andrew.wang@jpl.nasa.gov / andrew.c.good@jpl.nasa.gov
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Week in images: 10-14 November 2025
Week in images: 10-14 November 2025
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