Collision avoidance manoeuvres were executed on Copernicus Sentinel-1B to reduce the risk of collision with an object, potentially occurring at 08:33 UTC on 20 December 2020.

Three Sentinel-1B data download links through the European Data Relay Satellite System (EDRS), taking place between 08:05 UTC and 12:32 UTC on 20 December, had to be cancelled due to these orbit manoeuvres. SAR acquisitions taking place slightly before and during this period may have been affected.