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Mission type Earth observation
Mission duration Planned: 7.5 years[1]
Spacecraft properties
Manufacturer Thales Alenia Space[1]
Launch mass 1,250 kg (2,760 lb)[1]
Dimensions 3.9 × 2.2 × 2.2 m (12.8 × 7.2 × 7.2 ft)[1]
Power 2,300 watts[1]
Start of mission
Launch date
  • Sentinel-3A: 4. February 2016[2]
  • Sentinel-3B: early 2017
  • Sentinel-3C: before 2020
Launch site
Orbital parameters
Reference system Geocentric
Regime Sun-synchronous
Perigee 814 km (506 mi)
Inclination 98.6°
Repeat interval 27 days
Epoch Planned[3]
Copernicus Programme
← Sentinel-2 Sentinel-4

Sentinel-3 is an Earth observation satellite mission developed by the ESA as part of the Global Monitoring for Environment and Security GMES program.[3][4][5]

GMES is the European programme to establish a European capacity for Earth observation designed to provide European policy makers and public authorities with accurate and timely information to better manage the environment, and to understand and mitigate the effects of climate change.


On 14 April 2008, the European Space Agency and Thales Alenia Space signed a €305 million contract to build the first GMES Sentinel-3 in its Cannes Mandelieu Space Center.[6] Satellite platform was delivered to France for final components assembly in 2013.[7] Communications systems were completed by Thales Alenia Space España in early 2014.[8]

The Sentinel-3 mission's main objective is to measure sea-surface topography, sea- and land-surface temperature and ocean- and land-surface colour with accuracy in support of ocean forecasting systems, and for environmental and climate monitoring.[3][5][4] Sentinel-3 builds directly on the heritage pioneered by ERS-2 and Envisat satellites. Near-real time data will be provided for ocean forecasting, sea-ice charting, and maritime safety services on the state of the ocean surface, including surface temperature, marine ecosystems, water quality and pollution monitoring.[5]

A pair of Sentinel-3 satellites will enable a short revisit time of less than two days for OLCI instrument and less than one day for SLSTR at the equator. The satellite orbit provides a 27-day repeat for the topography package, with a 4-day sub-cycle.[5]


Mission objectives are: [3][5]

  • Measure sea-surface topography, sea-surface height and significant wave height
  • Measure ocean and land-surface temperature
  • Measure ocean and land-surface colour
  • Monitor sea and land ice topography
  • Sea-water quality and pollution monitoring
  • Inland water monitoring, including rivers and lakes
  • Aid marine weather forecasting with acquired data
  • Climate monitoring and modelling
  • Land-use change monitoring
  • Forest cover mapping
  • Fire detection
  • Weather forecasting
  • Measuring Earth's thermal radiation for atmospheric applications

Mission characteristics


Sentinel-3 will make use of multiple sensing instruments:[3][5]

  • SLSTR (Sea and Land Surface Temperature Radiometer) will determine global sea-surface temperatures to an accuracy of better than 0.3 K (0.3 °C; 0.5 °F). It measures in nine spectral channels and two additional bands optimised for fire monitoring.
  • OLCI (Ocean and Land Colour Instrument) is a medium-resolution imaging spectrometer that uses five cameras to provide a wide field of view. SLSTR and OLCI are optical instruments with an overlap of their swath path, allowing for new combined applications.
  • SRAL (SAR Altimeter) is the main topographic instrument to provide accurate topography measurements over sea ice, ice sheets, rivers and lakes. It uses dual-frequency Ku and C band and is supported by a microwave radiometer for atmospheric correction and a DORIS receiver for orbit positioning.
  • DORIS is a receiver for orbit positioning.
  • MWR (Microwave Radiometer) will measure water vapour and cloud water content and the thermal radiation emitted by the Earth.
  • LRR (Laser Retroreflector) will be used to accurately locate the satellite in orbit using a laser ranging system. When used in combination with SRAL, DORIS, MWR, they will acquire detailed topographic measurements of the ocean and in-land water.
  • GNSS (Global Navigation Satellite System) will provide precise orbit determination and can track multiple satellites simultaneously.


The observations acquired by the mission will be used to in conjunction with other ocean-observing missions to contribute to the Global Ocean Observing System (GOOS) which aims to create a permanent system of ocean observation.[9]

  • Ocean colour and land reflectance data
  • Sea, land and ice surface temperature
  • Active fire and burnt area monitoring
  • Sea surface topography data


  1. 1.0 1.1 1.2 1.3 1.4 "Copernicus: Sentinel-3". eoPortal. European Space Agency. Retrieved 21 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. 2.0 2.1 "Launch Schedule". Spaceflight Now. Archived from the original on 20 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. 3.0 3.1 3.2 3.3 3.4 "Sentinel 3". European Space Agency. 2015. Retrieved 10 June 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  4. 4.0 4.1 Lua error in Module:Citation/CS1/Identifiers at line 47: attempt to index field 'wikibase' (a nil value).
  5. 5.0 5.1 5.2 5.3 5.4 5.5 "Copernicus: Sentinel-3". European Space Agency. 2015. Retrieved 11 June 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  6. "Contract signed for ESA's Sentinel-3 earth observation satellite". European Space Agency. 14 April 2008. Retrieved 17 August 2014.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  7. "Bringing Sentinel-3 together". European Space Agency. 6 March 2013. Retrieved 17 August 2014.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  8. "Thales Alenia Space España's contribution to Europe's Sentinel satellites". Thales Alenia Group. 24 April 2014. Retrieved 17 August 2014.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  9. "Sentinel-3 stacks up". European Space Agency. 24 April 2014. Retrieved 21 December 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>

External links