Photo: Bill Ingalls · Public domain (US government)
Mission
Government/Top Secret · GTO
This geostationary satellite is tasked with providing capabilities for early missile warning and missile defense.
What it put in orbit
Passes over you When will it cross your sky, and can you see it?
| Object | Type | Orbit | Globe |
|---|---|---|---|
| SBIRS GEO-4 (USA 273) 2017-004A | Payload | 35779 × 35794 km · 2.5° | Globe |
| ATLAS 5 CENTAUR R/B 2017-004B | Rocket body | re-entered 2019-11-19 |
COSPAR ID 2017-004. Orbits from the CelesTrak satellite catalogue (perigee × apogee, inclination).