🛰️ SATELLITE · HISTORICAL RECORD
JUMPSEAT 4
Retired 1980JUMPSEAT 4 (NORAD 7687, COSPAR 1975-017A) is a retired US satellite, withdrawn from service around 1 Jan 1980, launched on 10 Mar 1975 on the Jumpseat 4 mission. It was operated by NRO / SAFSP as part of the Jumpseat programme. The spacecraft was built by HSES on the Jumpseat bus, with a mass of 1,000 kg. Historical record from Orbital Radar's satellite archive, cross-referenced with the live satellite catalogue.
1975
launched
1980
retired
51
years on orbit
1,000
kg mass
Lifecycle
Launched10 Mar 1975 · on the Jumpseat 4 mission
Operational1 Jan 1980 · entered service
Retired1 Jan 1980 · end of operational service
StatusOn orbit (not live-tracked)
Specifications
NORAD ID7687
COSPAR1975-017A
TypeSatellite
OperatorNRO / SAFSP
Country / StateUS
ManufacturerHSES
BusJumpseat
Mass1,000 kg
ProgrammeJumpseat
CategorySIG
OrbitHEO (HEO/M)
Altitude342 × 39,577 km
Inclination63.5°
Frequently asked questions
What happened to JUMPSEAT 4?
JUMPSEAT 4 was retired from service around 1 Jan 1980 after launching in 1975. It is no longer operational but remains catalogued.
Who operated and built JUMPSEAT 4?
JUMPSEAT 4 was operated by NRO / SAFSP and built by HSES (US).
Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.