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SatelliteIndex

Satellite · NORAD 81 · COSPAR 1961-004A

EXPLORER 9

DecayedPayloadLEOUnknown derived

Altitude now

—

object decayed

Velocity

—

Inclination

38.84°

Period

93.0 min

93.0 min

Perigee

285km

Apogee

559km

orbit unavailableNo orbital element set on file — decayed 09 Apr 1964.· Metadata updated 9 h ago

Live position

Live position

Live position unavailable — this object re-entered the atmosphere on 09 Apr 1964 and is no longer tracked.

Mission

Mission & classification

Mission type derived
Unknown
Object type
Payload
SATCAT ops status
Decayed [D]
Radar cross-section
—

CelesTrak groups

Not listed in any CelesTrak group.

Aliases

  • EXPLORER 9Celestrak Satcat

Ownership

Operator & country

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

Launch

Launch

Launch page →
Launch date
16 Feb 1961
COSPAR launch id
1961-004
Launch site
Wallops Flight Facility / MARS, Virginia

Objects from the same launch · 7

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
81
COSPAR / international designator
1961-004A
SatelliteIndex id
sat_01M28X3JJ8WJHWTANJEEAGWQ95
Canonical slug
explorer-9-81

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.