Sentinel-1 / eo constellation
sourcingtypical 4/5 · 14 factssarEuropean Unionoperational
Sentinel-1 is Europe's radar Earth observation mission, providing an all-weather, day-and-night supply of imagery of Earth's surface using an advanced radar instrument. The Copernicus Sentinel-1 mission is designed as a two-satellite constellation to support land and ocean monitoring and emergency response.
key specs
faq
Who operates Sentinel-1?
Sentinel-1 is operated by European Space Agency (ESA). (source, as of 2026-07-05)
How many Sentinel-1 satellites are active on orbit?
CelesTrak's catalog currently tracks 4 objects for Sentinel-1. (source, as of 2026-07-11)
When did Sentinel-1 first launch?
Sentinel-1 first launched on 2014-04-03. (source, as of 2026-07-05)
imaging modes
Stripmapresolution5 mswath80 km
Interferometric Wide swath (5 m x 20 m)resolutionnot statedswath250 km
Extra Wide swath (20 m x 40 m)resolutionnot statedswath410 km
Wave (5 m x 20 m, 20 km x 20 km vignettes)resolutionnot statedswath20 km
facts
operatorEuropean Space Agency (ESA)
countryEuropean Union
sensor typessar
sats launched (total)4
sats active (claimed)2
sats active (verified)4
sats plannedunknown
orbit693 km orbit altitude
first launch2014-04-03
latest launch2025-11-04
statusoperational
websiteesa.int
resolution (m)5
revisitrepeat cycle of 12 days per satellite; six days with both satellites operating
spectral bandsC-band
sats active (verified) counts objects currently tracked in CelesTrak's catalog for this constellation. It is a tracking count, not an operator claim about satellite health.
orbit
orbit693 km orbit altitude
sats launched (total)4
sats active (claimed)2
sats active (verified)4
sats plannedunknown
sources
[1] esa.int ↗
sensor typesfirst-party2026-07-05sats active (claimed)first-party2026-07-06orbitfirst-party2026-07-05first launchfirst-party2026-07-05latest launchfirst-party2026-07-05statusfirst-party2026-07-05websitefirst-party2026-07-05
[4] celestrak.org ↗
sats active (verified)computed2026-07-11