🛰️ SATELLITE · HISTORICAL RECORD
Triad OI-1X
Retired 1985Triad OI-1X (NORAD 6173, COSPAR 1972-069A) is a retired US satellite, withdrawn from service around 1 Jan 1985, launched on 2 Sep 1972 on the Triad OI-1X mission. It was operated by NAVAIR as part of the NNS I programme. The spacecraft was built by APL on the Triad bus, with a mass of 94 kg. Historical record from Orbital Radar's satellite archive, cross-referenced with the live satellite catalogue.
1972
launched
1985
retired
54
years on orbit
94
kg mass
Lifecycle
Launched2 Sep 1972 · on the Triad OI-1X mission
Operational1 Oct 1972 · entered service
Retired1 Jan 1985 · end of operational service
StatusOn orbit (not live-tracked)
Specifications
NORAD ID6173
COSPAR1972-069A
TypeSatellite
OperatorNAVAIR
Country / StateUS
ManufacturerAPL
BusTriad
Mass94 kg
ProgrammeNNS I
CategoryNAV
OrbitLEO (LEO/P)
Altitude741 × 837 km
Inclination90.1°
Frequently asked questions
What happened to Triad OI-1X?
Triad OI-1X was retired from service around 1 Jan 1985 after launching in 1972. It is no longer operational but remains catalogued.
How long was Triad OI-1X operational?
Triad OI-1X was operational for roughly 12 years, from 1 Oct 1972 to 1 Jan 1985.
Who operated and built Triad OI-1X?
Triad OI-1X was operated by NAVAIR and built by APL (US).
Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.