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SatelliteIndex

Satellite · NORAD 21574 · COSPAR 1991-050A

ERS-1

UnknownPayloadLEOUnknown derived

Altitude now

—

no element set

Velocity

—

Inclination

98.78°

Period

100.0 min

100.0 min

Perigee

737km

Apogee

783km

orbit unavailableNo orbital element set on file.· Metadata updated 11 h ago

Live position

Live position

Live position unavailable — no public orbital element set exists for this object (it may be classified, untracked or too small to catalogue).

Mission

Mission & classification

Mission type derived
Unknown
Object type
Payload
SATCAT ops status
Non-operational [-]
Radar cross-section
10.3 m²

CelesTrak groups

Aliases

  • ERS-1Celestrak Satcat

Ownership

Operator & country

Operator
European Space Agency
SATCAT owner code
ESA · European Space Agency
Country
—

Launch

Launch

Launch page →
Launch date
17 Jul 1991
COSPAR launch id
1991-050
Launch site
Guiana Space Centre, Kourou

Objects from the same launch · 18

All objects from launch 1991-050 →

Change log

History

No changes recorded since first ingestion on 11 Sept 2026 18:54 UTC. Status, orbit class, name and ownership changes are logged here as sources are re-ingested.

Regulatory

UN registration

UN Register of Objects Launched into Outer Space (UNOOSA) — connector planned, not yet ingested; registration unavailable

Transparency

Sources & provenance

All sources →

No source is linked to this record yet — the catalogue row exists but no provenance entry has been written for it.

Field provenance

No field-level provenance recorded.

Timeline

Events

All events →

No events detected for this object yet. Launches, decays and orbit changes are generated by the derived-analytics connector.

Reference

Identifiers

NORAD catalogue number
21574
COSPAR / international designator
1991-050A
SatelliteIndex id
sat_01M28X3JPKDVSSD2Y60ZHP1X10
Canonical slug
ers-1-21574

Orbit class, mission type and constellation membership are derived by SatelliteIndex (Unknown) — see the methodology. Positions are propagated estimates, not tracking measurements; never use them for conjunction assessment.