NIMBUS 6

NIMBUS 6 is an active satellite operated by GSFC (United States), launched on 1975-06-12 from Vandenberg Space Force Base, United States on the Nimbus F 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 1,101 km and 1,112 km with an inclination of 100.0°. It travels at approximately 26,284 km/h (7.30 km/s), completing one full orbit every 107 minutes — that’s roughly 13.41 orbits per day. Its near-circular orbit (eccentricity close to zero) means it maintains a very consistent altitude throughout each revolution. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~500–1,000 years. Orbital Radar tracks NIMBUS 6 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

NIMBUS 6 orbits at an average altitude of 1,107 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 NIMBUS 6’s average altitude, there are currently 439 active payloads and 485 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0041. With an inclination of 100.0°, NIMBUS 6 passes over latitudes between 100.0°N and 100.0°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 13,279 active satellites in total, of which 41 share a similar altitude band with NIMBUS 6.