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🛰️ SATELLITE · HISTORICAL RECORD

GAMBIT-3 FM-51

Re-entered 20 Jun 1981

GAMBIT-3 FM-51 (NORAD 12315, COSPAR 1981-019A) was a US satellite that re-entered Earth's atmosphere on 20 Jun 1981, launched on 28 Feb 1981 on the GAMBIT-3 Mission 4351 mission. It was operated by NRO / SAFSP as part of the KH8E programme. The spacecraft was built by LMSC on the KH-8 bus, with a mass of 2,400 kg. Like most satellites in low orbits, it was gradually slowed by atmospheric drag until re-entry. Historical record from Orbital Radar's satellite archive, cross-referenced with the live satellite catalogue.

1981
launched
1981
re-entered
0
years on orbit
2,400
kg mass

Lifecycle

Launched28 Feb 1981 · on the GAMBIT-3 Mission 4351 mission
Operational20 Jun 1981 · entered service
Retired20 Jun 1981 · end of operational service
Re-entered20 Jun 1981 · atmospheric re-entry — object destroyed

Specifications

NORAD ID12315
COSPAR1981-019A
TypeSatellite
OperatorNRO / SAFSP
Country / StateUS
ManufacturerLMSC
BusKH-8
Mass2,400 kg
ProgrammeKH8E
CategoryIMG
OrbitLEO (LLEO/S)
Altitude126 × 263 km
Inclination96.3°

Frequently asked questions

What happened to GAMBIT-3 FM-51?

GAMBIT-3 FM-51 re-entered Earth's atmosphere on 20 Jun 1981, ending a mission that began with its launch in 1981. Objects in low orbits are gradually slowed by atmospheric drag until they fall back and burn up on re-entry.

When did GAMBIT-3 FM-51 re-enter the atmosphere?

GAMBIT-3 FM-51 re-entered on 20 Jun 1981, according to Orbital Radar's historical catalogue records.

Who operated and built GAMBIT-3 FM-51?

GAMBIT-3 FM-51 was operated by NRO / SAFSP and built by LMSC (US).

Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.