🛰️ SATELLITE · HISTORICAL RECORD
SERT 2
Retired 1991SERT 2 (NORAD 4327, COSPAR 1970-009A) is a retired US satellite, withdrawn from service around 1 Nov 1991, launched on 4 Feb 1970 on the SERT 2 mission. It was operated by LERC as part of the SERT programme. The spacecraft was built by LERC on the SERT bus, with a mass of 591 kg. Historical record from Orbital Radar's satellite archive, cross-referenced with the live satellite catalogue.
1970
launched
1991
retired
56
years on orbit
591
kg mass
Lifecycle
Launched4 Feb 1970 · on the SERT 2 mission
Operational1 Nov 1991 · entered service
Retired1 Nov 1991 · end of operational service
StatusOn orbit (not live-tracked)
Specifications
NORAD ID4327
COSPAR1970-009A
TypeSatellite
OperatorLERC
Country / StateUS
ManufacturerLERC
BusSERT
Mass591 kg
ProgrammeSERT
CategoryTECH
OrbitLEO (LEO/S)
Altitude1,020 × 1,032 km
Inclination99.1°
Frequently asked questions
What happened to SERT 2?
SERT 2 was retired from service around 1 Nov 1991 after launching in 1970. It is no longer operational but remains catalogued.
Who operated and built SERT 2?
SERT 2 was operated by LERC and built by LERC (US).
Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.