THOR AGENA B R/B

THOR AGENA B R/B is a spent rocket body associated with United States, launched on 1966-05-15 from Vandenberg Space Force Base, United States on the Nimbus C launch. After more than 60 years in orbit, it is one of the longest-surviving objects in the space catalogue. It orbits in Low Earth Orbit (LEO) at altitudes between 1,081 km and 1,165 km with an inclination of 100.3°. It travels at approximately 26,255 km/h (7.29 km/s), completing one full orbit every 108 minutes — that’s roughly 13.36 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~500–1,000 years. Spent rocket bodies like THOR AGENA B 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.

THOR AGENA B R/B orbits at an average altitude of 1,123 km in the upper LEO band, where atmospheric drag is negligible and objects can persist for centuries to millennia. This altitude is used by broadband constellations like OneWeb and by scientific missions requiring stable orbits far from the densest debris bands. Within ±50 km of THOR AGENA B R/B’s average altitude, there are currently 282 active payloads and 453 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0041, ONEWEB-0250, ONEWEB-0685. With an inclination of 100.3°, THOR AGENA B R/B passes over latitudes between 100.3°N and 100.3°S, providing near-global coverage including the polar regions. Polar and near-polar orbits are used for reconnaissance, weather monitoring and Earth-observation missions that need to image every part of the planet. United States operates approximately 13,206 active satellites in total, of which 34 share a similar altitude band with THOR AGENA B R/B.