ERS 1

Satellite information

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Satellite Type and Status

PAYLOADIN ORBIT

Key statistics

Satellite ERS 1 at a glance.

Uptime

12408

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: 100.055 minutes

Inclination: 98.7914 deg

SMA: 7139.253 km

Apoapsis: 783.524 km

Periapsis: 738.711 km

RAAN: 193.6239 deg

Eccentricy: 0.0031385

Argument of periapsis: 213.3129 deg

Mean anomaly: 146.6083 deg

Mean motion: 14.39208184 rev/day

Mean motion (dot): 0.00000168 rev/day2

B* drag term: 0.000068748 1/REarth

Two-line elements (TLE)

Creation date: July 5, 2025, 10:36 p.m.

Reference frame: TEME

Reference center: EARTH

Epoch: July 5, 2025, 3:13 p.m. UTC

TLE line 0: 0 ERS 1

TLE line 1: 1 21574U 91050A 25186.63422761 .00000168 00000-0 68748-4 0 9999

TLE line 2: 2 21574 98.7914 193.6239 0031385 213.3129 146.6083 14.39208184780174

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.

Target Orbit TCA Probability of collision Miss distance Type
METEOR 2-8 DEB LEO 2025-02-06 14:08:02 0.0001020678 899.0 (m) DEBRIS
CZ-2C DEB SSO 2025-01-30 07:36:19 0.002649417 299.0 (m) DEBRIS
DELTA 1 DEB SSO 2024-12-21 21:30:30 0.0001527946 109.0 (m) DEBRIS
FENGYUN 1C DEB SSO 2024-12-07 07:15:25 0.0004226136 302.0 (m) DEBRIS
CZ-6A DEB LEO 2024-12-07 03:19:35 0.0001164047 853.0 (m) DEBRIS

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.

Launch to space Ariane 40 | ERS-1
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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