DELTA 1 DEB

DELTA 1 DEB is a tracked piece of space debris attributed to United States, launched on 1977-07-14 from Cape Canaveral, Florida. With over 49 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Low Earth Orbit (LEO) at altitudes between 511 km and 1,637 km with an inclination of 29.1°. It travels at approximately 26,341 km/h (7.32 km/s), completing one full orbit every 107 minutes — that’s roughly 13.50 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~500–1,000 years. As orbital debris, DELTA 1 DEB poses a potential collision risk to operational satellites in nearby orbits and is continuously monitored by the U.S. Space Surveillance Network and other tracking systems.

DELTA 1 DEB orbits at an average altitude of 1,074 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 1 DEB’s average altitude, there are currently 187 active payloads and 410 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0041. With an inclination of 29.1°, DELTA 1 DEB passes over latitudes between 29.1°N and 29.1°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 12,261 active satellites in total, of which 14 share a similar altitude band with DELTA 1 DEB.