COSMOS 663

COSMOS 663 is an active satellite operated by Soviet Navy (Russia (CIS)), launched on 1974-06-27 from Plesetsk Cosmodrome, Russia on the Zaliv launch. After more than 52 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 961 km and 996 km with an inclination of 83.0°. It travels at approximately 26,512 km/h (7.36 km/s), completing one full orbit every 105 minutes — that’s roughly 13.76 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~100–500 years. Orbital Radar tracks COSMOS 663 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

COSMOS 663 orbits at an average altitude of 979 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 663’s average altitude, there are currently 417 active payloads and 1,174 tracked debris or rocket body fragments. With an inclination of 83.0°, COSMOS 663 passes over latitudes between 83.0°N and 83.0°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. Russia (CIS) operates approximately 1,553 active satellites in total, of which 200 share a similar altitude band with COSMOS 663.