🛰️ SATELLITE · HISTORICAL RECORD
US-A No. 311 ROCh
Retired 1971US-A No. 311 ROCh (NORAD 5105, COSPAR 1971-025A) is a retired SU satellite, withdrawn from service around 2 Apr 1971, launched on 1 Apr 1971 on the US-A reactor mission. It was operated by TSKBM as part of the US-A programme. The spacecraft was built by TSKBM/KB1 on the US-A reactor bus, with a mass of 1,150 kg. Historical record from Orbital Radar's satellite archive, cross-referenced with the live satellite catalogue.
1971
launched
1971
retired
55
years on orbit
1,150
kg mass
Lifecycle
Launched1 Apr 1971 · on the US-A reactor mission
Operational2 Apr 1971 · entered service
Retired2 Apr 1971 · end of operational service
StatusOn orbit (not live-tracked)
Specifications
NORAD ID5105
COSPAR1971-025A
TypeSatellite
OperatorTSKBM
Country / StateSU
ManufacturerTSKBM/KB1
BusUS-A reactor
Mass1,150 kg
ProgrammeUS-A
CategorySIG
OrbitLEO (LEO/I)
Altitude948 × 1,034 km
Inclination65.0°
Frequently asked questions
What happened to US-A No. 311 ROCh?
US-A No. 311 ROCh was retired from service around 2 Apr 1971 after launching in 1971. It is no longer operational but remains catalogued.
Who operated and built US-A No. 311 ROCh?
US-A No. 311 ROCh was operated by TSKBM and built by TSKBM/KB1 (SU).
Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.