IUS R/B(2)

IUS R/B(2) is a spent rocket body associated with United States, launched on 2001-08-06 from Cape Canaveral, Florida on the DSP launch. With over 25 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Geostationary Orbit (GEO) at altitudes between 35,862 km and 35,921 km with an inclination of 12.9°. It travels at approximately 11,056 km/h (3.07 km/s), completing one full orbit every ~24 hours (geosynchronous) — that’s roughly 1.00 orbits per day. At geostationary altitude, there is no meaningful atmospheric drag — this object will remain in orbit indefinitely unless actively deorbited. Spent rocket bodies like IUS R/B(2) are among the largest pieces of uncontrolled space debris and are priority targets for collision avoidance manoeuvres and future active debris removal efforts.

IUS R/B(2) occupies geostationary orbit at approximately 35,786 km above the equator, where its orbital period matches the Earth’s 24-hour rotation. From the ground, it appears to hover over a fixed point — ideal for broadcast television, weather monitoring and wideband communications. With an inclination of 12.9°, it traces a small figure-of-eight pattern relative to the equator rather than remaining perfectly stationary, which can indicate aging stationkeeping fuel or a deliberate inclined-orbit strategy. Within ±50 km of IUS R/B(2)’s average altitude, there are currently 57 active payloads and 24 tracked debris or rocket body fragments. United States operates approximately 12,413 active satellites in total, of which 16 share a similar altitude band with IUS R/B(2).