ERS-1
Launch
Launched on Jul 17, 1991 from Ariane Launch Area 2, French Guiana aboard a Ariane 40.
Ariane 40 | ERS-1 →
Live · TLE epoch 2026-09-09 11:25 UTC
Orbit class
SSO — Sun-Synchronous (LEO at 96–102° inclination)
Operator
ESA Centre for Earth Observation
Country
European Space Agency
Manufacturer
DASA
Launched
Jul 17, 1991
Mass
2,384 kg
Apogee
787 km
Perigee
741 km
Inclination
98.78°
Period
1.67 h
Altitude history
Apogee and perigee for ERS-1 across 103 days of archived orbital elements (105 element sets, one per day).
Trend
Stable
Change
-0.2 km
Rate
-0.00 km/day
Now
741 × 787 km
Apogee Perigee
Derived from our own archive of CelesTrak orbital elements, sampled every 3 hours. Short windows show drag and station-keeping; they are not a reentry prediction.
Launched with
One other catalogued object still in orbit from launch 1991-050 (Ariane 40 | ERS-1).
- ARIANE 40 R/B · 21610
Sources & further reading
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