DELTA 2 R/B

DELTA 2 R/B is a spent rocket body associated with United States, launched on 2000-11-21 from Vandenberg SFB, California on the Earth Orbiter 1 launch. With over 26 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Low Earth Orbit (LEO) at altitudes between 698 km and 1,787 km with an inclination of 95.4°. It travels at approximately 26,048 km/h (7.24 km/s), completing one full orbit every 110 minutes — that’s roughly 13.05 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is thousands of years. Spent rocket bodies like DELTA 2 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.

DELTA 2 R/B orbits at an average altitude of 1,243 km in the uppermost reaches of Low Earth Orbit. At this altitude, orbital decay is effectively zero without active deorbiting, and coverage footprints are significantly larger than lower LEO, though at the cost of higher latency. Within ±50 km of DELTA 2 R/B’s average altitude, there are currently 462 active payloads and 307 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0012, ONEWEB-0010, ONEWEB-0008. With an inclination of 95.4°, DELTA 2 R/B passes over latitudes between 95.4°N and 95.4°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 12,413 active satellites in total, of which 3 share a similar altitude band with DELTA 2 R/B.