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SatelliteIndex

Satellite · NORAD 21527 · COSPAR 1991-045A

REX 1

UnknownPayloadLEOUnknown derived

Altitude now

—

no element set

Velocity

—

Inclination

89.53°

Period

101.2 min

101.2 min

Perigee

762km

Apogee

864km

orbit unavailableNo orbital element set on file.· Metadata updated 17 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
Radar cross-section
0.5 m²

CelesTrak groups

Not listed in any CelesTrak group.

Aliases

  • REX 1Celestrak Satcat

Ownership

Operator & country

Operator
—
SATCAT owner code
US · United States
Country
United States US

Launch

Launch

Launch page →
Launch date
29 Jun 1991
COSPAR launch id
1991-045
Launch site
Vandenberg Space Force Base (Western Range), California

Objects from the same launch · 5

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
21527
COSPAR / international designator
1991-045A
SatelliteIndex id
sat_01M28X3JPKDVSSD2Y60ZHP1WZH
Canonical slug
rex-1-21527

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.