🛰️ SATELLITE · HISTORICAL RECORD
DMSP Block 5A F-1
Retired 1970DMSP Block 5A F-1 (NORAD 4331, COSPAR 1970-012A) is a retired US satellite, withdrawn from service around 30 Apr 1970, launched on 11 Feb 1970 on the DAPP Block 5A F-1 mission. It was operated by SAMSO as part of the DMSP 5A programme. The spacecraft was built by RCA on the DMSP Block 5A bus, with a mass of 104 kg. Historical record from Orbital Radar's satellite archive, cross-referenced with the live satellite catalogue.
1970
launched
1970
retired
56
years on orbit
104
kg mass
Lifecycle
Launched11 Feb 1970 · on the DAPP Block 5A F-1 mission
Operational30 Apr 1970 · entered service
Retired30 Apr 1970 · end of operational service
StatusOn orbit (not live-tracked)
Specifications
NORAD ID4331
COSPAR1970-012A
TypeSatellite
OperatorSAMSO
Country / StateUS
ManufacturerRCA
BusDMSP Block 5A
Mass104 kg
ProgrammeDMSP 5A
CategoryMET
OrbitLEO (LEO/S)
Altitude773 × 869 km
Inclination98.7°
Frequently asked questions
What happened to DMSP Block 5A F-1?
DMSP Block 5A F-1 was retired from service around 30 Apr 1970 after launching in 1970. It is no longer operational but remains catalogued.
Who operated and built DMSP Block 5A F-1?
DMSP Block 5A F-1 was operated by SAMSO and built by RCA (US).
Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.