🛰️ SATELLITE · HISTORICAL RECORD
ORION 4
Historical recordORION 4 (NORAD 25336, COSPAR 1998-029A) is a historical US catalogue entry no longer tracked in the live catalogue, launched on 9 May 1998 on the ORION 4 mission. It was operated by NROC / 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. Historical 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
Specifications
NORAD ID25336
COSPAR1998-029A
TypeSatellite
OperatorNROC / 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 happened to ORION 4?
ORION 4 is a historical catalogue entry from a 1998 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 ORION 4?
ORION 4 was operated by NROC / NSA and built by UNKUS (US).
Historical record from the Orbital Radar satellite archive. Sources & methodology: data sources. Accessed 2026-09-06.