🛰️ SATELLITE · CATALOGUE RECORD
USA 139
In orbitUSA 139 (NORAD 25336, COSPAR 1998-029A) is a US satellite in orbit, launched on 9 May 1998 on the ORION 4 mission. It is catalogued as ORION 4. It is operated by NRO / NSA as part of the ORION1 programme. The spacecraft was built by UNKUS on the Adv ORION bus, with a mass of 5,000 kg. No current orbital elements are published for it, so it is not shown on the live map or in pass predictions. Catalogue record from Orbital Radar's satellite archive, cross-referenced with the live satellite catalogue.
1998
launched
28
years on orbit
5,000
kg mass
Lifecycle
Launched9 May 1998 · on the ORION 4 mission
StatusOn orbit (not live-tracked)
Specifications
NORAD ID25336
COSPAR1998-029A
TypeSatellite
OperatorNRO / NSA
Country / StateUS
ManufacturerUNKUS
BusAdv ORION
Mass5,000 kg (4,600 kg dry)
ProgrammeORION1
CategorySIG
OrbitGEO (GEO/S)
Altitude35,780 × 35,800 km
Inclination0.1°
Frequently asked questions
What is USA 139?
USA 139 is a satellite launched in 1998 that is still in orbit. No current orbital elements are published for it, so it is not shown on the live map or in pass predictions.
Who operates and built USA 139?
USA 139 is operated by NRO / NSA and built by UNKUS (US).
Catalogue record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-10-21.