Key statistics
Satellite ERS 1 at a glance.
Uptime
12462
Days in orbit
Revolutions
≈ 14.4
Per day
Orbit
SSO
Sun Synchronous Orbit
Inclination
98.8
Latest
Satellite identification and parameters
Extended collection of information and parameters for ERS 1.
Object identification
Identified? True
Debris? False
Object name: ERS 1
International designator: 1991-050A
Object number (NORAD): 21574
Object ID (CCSDS): 21574
Country: EUROPEAN SPACE AGENCY (ESA)
Current information (Y/N): Y
RCS size: LARGE
Orbital parameters
Period: 100.053 minutes
Inclination: 98.7941 deg
SMA: 7139.141 km
Apoapsis: 784.606 km
Periapsis: 737.406 km
RAAN: 249.3004 deg
Eccentricy: 0.00330571
Argument of periapsis: 55.3535 deg
Mean anomaly: 305.0761 deg
Mean motion: 14.39242083 rev/day
Mean motion (dot): 0.00000413 rev/day2
B* drag term: 0.00014720463 1/REarth
Two-line elements (TLE)
Creation date: Aug. 29, 2025, 2:15 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Aug. 28, 2025, 10:20 p.m. UTC
TLE line 0: 0 ERS 1
TLE line 1: 1 21574U 91050A 25240.93074535 .00000413 00000-0 14720-3 0 9998
TLE line 2: 2 21574 98.7941 249.3004 0033057 55.3535 305.0761 14.39242083788006
Live tracking on map
Real-time ground track for satellite ERS 1.
In-orbit conjunctions
A list of the most updated potential collisions computed for object ERS 1.
Associated space launch
ERS (European Remote Sensing Satellite) are a family of multi-disciplinary Earth Observation Satellites.
ERS 1 was lifted into orbit during the mission ‘Ariane 40 | ERS-1’, on board a Ariane 40 space rocket.
The launch took place on July 17, 1991, 1:46 a.m. from Ariane Launch Area 2.
For more information about the launch, click the button.
Ariane 40 | ERS-1
Agency: N/A
Status: Launch Successful
Launch date: July 17, 1991, 1:46 a.m. UTC
Rocket: Ariane 40
Launch pad: Ariane Launch Area 2
Location: Guiana Space Centre, French Guiana
...
Latest news about this satellite
There are no fresh news available about this satellite. Check back as we update our databases every day.
Newsletter sign-up
Weekly statistics, charts and insights to help you stay on top of the space industry.
