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 Space Force Station, United States on the GMS launch. With over 49 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Low Earth Orbit (LEO) at altitudes between 512 km and 1,283 km with an inclination of 29.1°. It travels at approximately 26,659 km/h (7.41 km/s), completing one full orbit every 103 minutes — that’s roughly 13.99 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~100–500 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 898 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 272 active payloads and 1,648 tracked debris or rocket body fragments. 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 13,196 active satellites in total, of which 102 share a similar altitude band with DELTA 1 DEB.