Sentinel-1B was a European radar imaging satellite launched on 25 April 2016.

It is the second of two original satellites in the Sentinel-1 constellation, part of the European Union's Copernicus programme on Earth observation.

The satellite carries a C-SAR sensor, capable of providing high-resolution imagery regardless of weather conditions.

The satellite made its first observation on 28 April 2016, capturing a 250 kilometres (160 mi) wide image of the Austfonna glacier on Svalbard.

[7] Beginning on December 23, 2021, the spacecraft experienced an anomaly which resulted in a loss of data transmission.