OPS 8781

OPS 8781 is an active satellite operated by United States, launched on 1977-12-08 from Vandenberg SFB, California. With over 49 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Low Earth Orbit (LEO) at altitudes between 530 km and 1,207 km with an inclination of 63.3°. It travels at approximately 26,713 km/h (7.42 km/s), completing one full orbit every 102 minutes — that’s roughly 14.07 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~100–500 years. Orbital Radar tracks OPS 8781 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

OPS 8781 orbits at an average altitude of 869 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 OPS 8781’s average altitude, there are currently 225 active payloads and 1,823 tracked debris or rocket body fragments — notable neighbours include NOAA 20. With an inclination of 63.3°, OPS 8781 passes over latitudes between 63.3°N and 63.3°S, covering most populated land masses in both hemispheres. This mid-inclination band balances global coverage with efficient launch energy requirements. United States operates approximately 12,360 active satellites in total, of which 38 share a similar altitude band with OPS 8781.