🛰️ SATELLITE · HISTORICAL RECORD
ERS 27
Retired 1968ERS 27 (NORAD 2769, COSPAR 1967-040E) is a retired US satellite, withdrawn from service around 1 Jan 1968, launched on 28 Apr 1967 on the Vela 4A mission. It was operated by AFSSD as part of the ORS III programme. The spacecraft was built by TRW on the ORS bus, with a mass of 9 kg. Historical record from Orbital Radar's satellite archive, cross-referenced with the live satellite catalogue.
1967
launched
1968
retired
59
years on orbit
9
kg mass
Lifecycle
Launched28 Apr 1967 · on the Vela 4A mission
Operational1 Jan 1968 · entered service
Retired1 Jan 1968 · end of operational service
StatusOn orbit (not live-tracked)
Specifications
NORAD ID2769
COSPAR1967-040E
TypeSatellite
OperatorAFSSD
Country / StateUS
ManufacturerTRW
BusORS
Mass9 kg
ProgrammeORS III
CategorySCI
Orbit (VHEO)
Altitude9,111 × 110,599 km
Inclination34.3°
Frequently asked questions
What happened to ERS 27?
ERS 27 was retired from service around 1 Jan 1968 after launching in 1967. It is no longer operational but remains catalogued.
Who operated and built ERS 27?
ERS 27 was operated by AFSSD and built by TRW (US).
Launched together
Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.