Sentinel-3B being mated with the Rockot adapter

Sentinel-3B being removed from the fuelling stand to be installed on its flight adapter.
The Copernicus Sentinel-3B satellite is being prepared for liftoff, scheduled for 25 April 2018. Its identical twin, Sentinel-3A, has been in orbit since February 2016. The two-satellite constellation offers optimum global coverage and data delivery for Europe’s Copernicus environment programme.