Photo: NASA · Public domain (US government)
Mission
Government/Top Secret · Direct-GEO
The Orion 3 and 4 (RIO 3, 4) satellites, which are generally known as 'Advanced Orion' or 'Mentor', are geostationary signals intelligence satellites, which replaced the Magnum / Orion series. Their purpose is to intercept missile telemetry from Russia and China and the COMINT capability of the…
What it put in orbit
| Object | Type | Orbit | Globe |
|---|---|---|---|
| USA 139 1998-029A | Payload | 35637 × 35936 km · 7.3° | Globe |
| TITAN 4B CENTAUR R/B 1998-029B | Rocket body | 35594 × 35986 km · 7.5° | Globe |
COSPAR ID 1998-029. Orbits from the CelesTrak satellite catalogue (perigee × apogee, inclination).