DIAMANT B-P4 DEB

DIAMANT B-P4 DEB is a tracked piece of space debris attributed to France, launched on 1975-02-06 from Guiana Space Centre, French Guiana on the Starlette launch. After more than 51 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 779 km and 1,049 km with an inclination of 49.8°. It travels at approximately 26,629 km/h (7.40 km/s), completing one full orbit every 103 minutes — that’s roughly 13.94 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~100–500 years. As orbital debris, DIAMANT B-P4 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.

DIAMANT B-P4 DEB orbits at an average altitude of 914 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 DIAMANT B-P4 DEB’s average altitude, there are currently 290 active payloads and 1,421 tracked debris or rocket body fragments. With an inclination of 49.8°, DIAMANT B-P4 DEB passes over latitudes between 49.8°N and 49.8°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. France operates approximately 124 active satellites in total, of which 2 share a similar altitude band with DIAMANT B-P4 DEB.