DELTA 2 R/B(1)

DELTA 2 R/B(1) is a spent rocket body associated with United States, launched on 1998-01-10 from Cape Canaveral, Florida on the Skynet 4D launch. With over 28 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Low Earth Orbit (LEO) at altitudes between 763 km and 1,288 km with an inclination of 26.9°. It travels at approximately 26,428 km/h (7.34 km/s), completing one full orbit every 106 minutes — that’s roughly 13.63 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~500–1,000 years. Spent rocket bodies like DELTA 2 R/B(1) are among the largest pieces of uncontrolled space debris and are priority targets for collision avoidance manoeuvres and future active debris removal efforts.

DELTA 2 R/B(1) orbits at an average altitude of 1,026 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 DELTA 2 R/B(1)’s average altitude, there are currently 271 active payloads and 643 tracked debris or rocket body fragments. With an inclination of 26.9°, DELTA 2 R/B(1) passes over latitudes between 26.9°N and 26.9°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, of which 18 share a similar altitude band with DELTA 2 R/B(1).