DELTA 1 DEB

DELTA 1 DEB is a tracked piece of space debris attributed to United States, launched on 1973-11-06 from Vandenberg SFB, California. After more than 53 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 1,503 km and 1,551 km with an inclination of 102.4°. It travels at approximately 25,575 km/h (7.10 km/s), completing one full orbit every 117 minutes — that’s roughly 12.35 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is thousands of 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 1,527 km in the uppermost reaches of Low Earth Orbit. At this altitude, orbital decay is effectively zero without active deorbiting, and coverage footprints are significantly larger than lower LEO, though at the cost of higher latency. Within ±50 km of DELTA 1 DEB’s average altitude, there are currently 159 active payloads and 255 tracked debris or rocket body fragments. With an inclination of 102.4°, DELTA 1 DEB passes over latitudes between 102.4°N and 102.4°S, providing near-global coverage including the polar regions. Polar and near-polar orbits are used for reconnaissance, weather monitoring and Earth-observation missions that need to image every part of the planet. United States operates approximately 12,261 active satellites in total.