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 456 km and 1,433 km with an inclination of 29.0°. It travels at approximately 26,574 km/h (7.38 km/s), completing one full orbit every 104 minutes — that’s roughly 13.86 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 945 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 316 active payloads and 1,112 tracked debris or rocket body fragments. With an inclination of 29.0°, DELTA 1 DEB passes over latitudes between 29.0°N and 29.0°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 12,259 active satellites in total, of which 88 share a similar altitude band with DELTA 1 DEB.