DELTA 2 R/B(1)

DELTA 2 R/B(1) is a spent rocket body associated with United States, launched on 1992-09-09 from Cape Canaveral, Florida on the Navstar GPS SVN 27 launch. With over 34 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Low Earth Orbit (LEO) at altitudes between 606 km and 650 km with an inclination of 19.8°. It travels at approximately 27,168 km/h (7.55 km/s), completing one full orbit every 97 minutes — that’s roughly 14.80 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~10–25 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 628 km in the mid-LEO band, where atmospheric drag is minimal but radiation exposure remains manageable. Objects at this altitude persist for decades to centuries, making debris mitigation critical. This regime is popular for remote sensing constellations and scientific instruments that need stable, long-duration orbits. Within ±50 km of DELTA 2 R/B(1)’s average altitude, there are currently 799 active payloads and 828 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0050, STARLINK-5823, STARLINK-34374. With an inclination of 19.8°, DELTA 2 R/B(1) passes over latitudes between 19.8°N and 19.8°S, concentrating coverage over equatorial and near-equatorial regions. Low-inclination orbits maximise revisit rates over specific tropical zones. United States operates approximately 12,413 active satellites in total, of which 349 share a similar altitude band with DELTA 2 R/B(1).