🛰️ SATELLITE · HISTORICAL RECORD
ERS 20
Historical recordERS 20 (NORAD 2768, COSPAR 1967-040D) is a historical US catalogue entry no longer tracked in the live catalogue, 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
59
years on orbit
9
kg mass
Lifecycle
Launched28 Apr 1967 · on the Vela 4A mission
Operational1 Jan 1982 · entered service
Specifications
NORAD ID2768
COSPAR1967-040D
TypeSatellite
OperatorAFSSD
Country / StateUS
ManufacturerTRW
BusORS
Mass9 kg
ProgrammeORS III
CategoryTECH
Orbit (VHEO)
Altitude8,982 × 110,845 km
Inclination33.3°
Frequently asked questions
What happened to ERS 20?
ERS 20 is a historical catalogue entry from a 1967 launch. It is not currently tracked in the live catalogue — typically meaning it has decayed, been retired, or its tracking elements have lapsed.
Who operated and built ERS 20?
ERS 20 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.