COSMOS 249 DEB

COSMOS 249 DEB is a tracked piece of space debris attributed to Russia (CIS), launched on 1968-10-20 from Baikonur, Kazakhstan. After more than 58 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 587 km and 1,632 km with an inclination of 62.3°. It travels at approximately 26,279 km/h (7.30 km/s), completing one full orbit every 107 minutes — that’s roughly 13.40 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~500–1,000 years. As orbital debris, COSMOS 249 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.

COSMOS 249 DEB orbits at an average altitude of 1,110 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 COSMOS 249 DEB’s average altitude, there are currently 279 active payloads and 369 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0041. With an inclination of 62.3°, COSMOS 249 DEB passes over latitudes between 62.3°N and 62.3°S, covering most populated land masses in both hemispheres. This mid-inclination band balances global coverage with efficient launch energy requirements. Russia (CIS) operates approximately 1,285 active satellites in total.