COSMOS 783

COSMOS 783 is an active satellite operated by GUKOS RVSN (Russia (CIS)), launched on 1975-11-28 from Plesetsk Cosmodrome, Russia on the Strela-2M 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 770 km and 788 km with an inclination of 74.1°. It travels at approximately 26,879 km/h (7.47 km/s), completing one full orbit every 100 minutes — that’s roughly 14.34 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~25–100 years. Orbital Radar tracks COSMOS 783 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

COSMOS 783 orbits at an average altitude of 779 km in the mid-LEO band, where atmospheric drag is minimal but radiation exposure remains manageable. Objects at this altitude persist for decades to centuries, making debris mitigation critical. This regime is popular for remote sensing constellations and scientific instruments that need stable, long-duration orbits. Within ±50 km of COSMOS 783’s average altitude, there are currently 446 active payloads and 2,419 tracked debris or rocket body fragments — notable neighbours include NOAA 20, ONEWEB-0455. With an inclination of 74.1°, COSMOS 783 passes over latitudes between 74.1°N and 74.1°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 1,527 active satellites in total, of which 74 share a similar altitude band with COSMOS 783.