Key statistics
Satellite ERS 1 at a glance.
Uptime
12512
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: 100.049 minutes
Inclination: 98.7942 deg
SMA: 7138.946 km
Apoapsis: 782.883 km
Periapsis: 738.74 km
RAAN: 300.634 deg
Eccentricy: 0.00309167
Argument of periapsis: 265.5093 deg
Mean anomaly: 94.2562 deg
Mean motion: 14.39300823 rev/day
Mean motion (dot): 0.00000519 rev/day2
B* drag term: 0.00018110685 1/REarth
Two-line elements (TLE)
Creation date: Oct. 18, 2025, 2:17 a.m.
Reference frame: TEME
Reference center: EARTH
Epoch: Oct. 17, 2025, 11:37 p.m. UTC
TLE line 0: 0 ERS 1
TLE line 1: 1 21574U 91050A 25290.98460514 .00000519 00000-0 18111-3 0 9999
TLE line 2: 2 21574 98.7942 300.6340 0030917 265.5093 94.2562 14.39300823795200
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
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