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 439 km and 813 km with an inclination of 28.9°. It travels at approximately 27,172 km/h (7.55 km/s), completing one full orbit every 97 minutes — that’s roughly 14.81 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~10–25 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 626 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 1 DEB’s average altitude, there are currently 1,022 active payloads and 876 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0050. This makes it one of the more crowded altitude bands, containing roughly 5.5% of all active satellites. With an inclination of 28.9°, DELTA 1 DEB passes over latitudes between 28.9°N and 28.9°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 523 share a similar altitude band with DELTA 1 DEB.