ATLAS CENTAUR R/B

ATLAS CENTAUR R/B is a spent rocket body associated with United States, launched on 1977-05-26 from Cape Canaveral, Florida on the INTELSAT IVA F4 launch. With over 49 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Medium Earth Orbit (MEO) at altitudes between 630 km and 36,126 km with an inclination of 21.5°. It travels at approximately 14,447 km/h (4.01 km/s), completing one full orbit every 10 hours 46 minutes — that’s roughly 2.23 orbits per day. Its orbital eccentricity of 0.7171 gives it a noticeably elliptical path, with significant altitude variation between perigee and apogee. Spent rocket bodies like ATLAS CENTAUR R/B are among the largest pieces of uncontrolled space debris and are priority targets for collision avoidance manoeuvres and future active debris removal efforts.

ATLAS CENTAUR R/B orbits at an average altitude of 18,378 km in Medium Earth Orbit, the region between LEO and GEO (2,000–35,786 km). MEO’s higher altitude gives each satellite a much larger ground footprint than LEO, meaning fewer spacecraft are needed for global coverage — but signal latency is higher and radiation from the Van Allen belts is a significant design constraint. Within ±50 km of ATLAS CENTAUR R/B’s average altitude, there are currently 1 active payload and 16 tracked debris or rocket body fragments. This is a relatively sparse altitude band, containing less than 1% of all active satellites. With an inclination of 21.5°, ATLAS CENTAUR R/B passes over latitudes between 21.5°N and 21.5°S, covering the tropical and temperate zones where most of the world’s population resides. Low-to-mid inclination orbits are efficient to reach from equatorial and mid-latitude launch sites. United States operates approximately 12,413 active satellites in total.