Seventh Sentinel satellite in orbit – Air & Cosmos

Copernicus Sentinel-3B, successfully placed in orbit in a Rockot launcher on April 25, joining his identical twin, Sentinel-3A.

The second Sentinel-3 satellite, Sentinel-3B has been successfully placed in orbit, joining its identical twin Sentinel-3A. This pairing of satellites increases the coverage and data delivery for the environmental program Copernicus of the European Union.

The Sentinel-3B satellite of 1150 kg – built by Thales Alenia Space for the European Space Agency (ESA) – was brought into its planned orbit in a Rockot launcher from Plesetsk, Russia, at 17 : 57 GMT of 25 th April.

The controllers are now checking that all the satellite systems are working and starting to calibrate the instruments to order the satellite. The mission is expected to begin routine operations after five months.

With this seventh Sentinel release, the first set of Sentinel missions for the Copernicus environmental monitoring network of the European Union are in orbit, bringing a range of technologies to monitor the Earth's and Earth's oceans and atmosphere. Sentinel-3 payload includes:

  • Two optical instruments: OLCI (marine and terrestrial instrument) and SLSTR (marine and terrestrial surface temperature radiometer)

  • Two radiofrequency (RF) instruments: SRAL (aperture radar) synthetic) Altimeter) and MWR (Microwave Radiometer), which will provide measurements to determine the topography of the oceans, sea ice and bodies of water on land.

Over the oceans, satellites measure the temperature and color of the sea surface, as well as sea levels and the thickness of sea ice. These measures are used, for example, to monitor changes in Earth's climate and for applications such as marine pollution.

On land, satellites monitor forest fires, map the land, monitor the health of vegetation and measure water levels in rivers and lakes.


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