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# Sentinel-1D becomes fully operational, restoring Europe's radar Earth observation
- URL: https://sovereigntymonitor.eu/news/2026-05-01-sentinel-1d-operational/
- Published: 2026-05-01T12:00:00.000Z
- Updated: 2026-09-01T10:50:38.000Z
- Description: ESA declared Sentinel-1D fully operational, restoring the two satellite C band radar constellation for the Copernicus programme lost when Sentinel-1B failed in 2021, giving Europe continuous all weather day and night Earth observation again.
- Author: Reidar Balstad
- Tags: Defence and space, #news, #verified

Verified [European Space Agency press release, 1 May 2026](https://www.esa.int/Applications/Observing%5Fthe%5FEarth/Copernicus/Sentinel-1/Sentinel-1D%5Fgoes%5Flive%5Fa%5Fmilestone%5Ffor%5FEurope%5Fs%5Fradar%5Fmission?ref=sovereigntymonitor.eu)

**What it does not test.** This does not establish any new funding decision beyond completion of the existing satellite's commissioning.

**How this item counts.** No movement: no answer to who owns, who operates, whose law governs or who made the parts changes. Weight 0\. Restores existing EU Copernicus radar capacity; owner/operator/law/parts unchanged. [European Sovereignty Index](https://sovereigntymonitor.eu/sovereignty-index/)