🛰️ SATELLITE · HISTORICAL RECORD
ERS 18
Retired 1968ERS 18 (NORAD 2767, COSPAR 1967-040C) is a retired US satellite, withdrawn from service around 3 Jun 1968, launched on 28 Apr 1967 on the Vela 4A mission.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
Operational3 Jun 1968 · entered service
Retired3 Jun 1968 · end of operational service
StatusOn orbit (not live-tracked)
Specifications
NORAD ID2767
COSPAR1967-040C
TypeSatellite
OperatorAFSSD
Country / StateUS
ManufacturerTRW
BusORS
Mass9 kg
ProgrammeORS III
CategoryAST
Orbit (VHEO)
Altitude8,990 × 110,839 km
Inclination33.3°
Frequently asked questions
What happened to ERS 18?
ERS 18 was retired from service around 3 Jun 1968 after launching in 1967. It is no longer operational but remains catalogued.
Who operated and built ERS 18?
ERS 18 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.