A Sentinel-1D satellite issue caused an unrecoverable loss of observations during October 28–29, 2026, according to an ESA operational notice published on October 29.
Sentinel-1D belongs to the Copernicus radar-imaging mission. Radar observations support measurements of Earth’s surface, including changes in land, ice, and ocean conditions.
The notice identifies the affected spacecraft and period and classifies the lost data as unrecoverable. That classification means the affected observations cannot subsequently be supplied as recovered products from those acquisitions.
For applications that compare observations over time, an acquisition gap changes the available sequence of measurements. Later observations record later conditions rather than recreating the missing acquisition.
ESA said that the impact would be reported on the Sentinel Operations Dashboard Events Page on the first working day after the anomaly. That dashboard entry is the agency’s designated operational record for the event’s effects.
