DELTA 1 DEB

DELTA 1 DEB is a tracked piece of space debris attributed to United States, launched on 1963-12-21 from Vandenberg Space Force Base, United States on the Tiros H launch. After more than 63 years in orbit, it is one of the longest-surviving objects in the space catalogue. It orbits in Low Earth Orbit (LEO) at altitudes between 647 km and 799 km with an inclination of 58.5°. It travels at approximately 26,985 km/h (7.50 km/s), completing one full orbit every 99 minutes — that’s roughly 14.51 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~25–100 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 723 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 325 active payloads and 1,858 tracked debris or rocket body fragments — notable neighbours include TERRA, AQUA, ONEWEB-0179. With an inclination of 58.5°, DELTA 1 DEB passes over latitudes between 58.5°N and 58.5°S, covering most populated land masses in both hemispheres. This mid-inclination band balances global coverage with efficient launch energy requirements. United States operates approximately 13,196 active satellites in total, of which 105 share a similar altitude band with DELTA 1 DEB.