COSMOS 1903

COSMOS 1903 is an active satellite operated by PVO (Russia (CIS)), launched on 1987-12-21 from Plesetsk Cosmodrome, Russia on the Oko launch. With over 39 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Medium Earth Orbit (MEO) at altitudes between 8,473 km and 31,853 km with an inclination of 69.0°. It travels at approximately 13,953 km/h (3.88 km/s), completing one full orbit every 11 hours 57 minutes — that’s roughly 2.01 orbits per day. Its orbital eccentricity of 0.4406 gives it a noticeably elliptical path, with significant altitude variation between perigee and apogee. Orbital Radar tracks COSMOS 1903 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

COSMOS 1903 orbits at an average altitude of 20,163 km in Medium Earth Orbit, the region between LEO and GEO (2,000–35,786 km). MEO’s higher altitude gives each satellite a much larger ground footprint than LEO, meaning fewer spacecraft are needed for global coverage — but signal latency is higher and radiation from the Van Allen belts is a significant design constraint. Within ±50 km of COSMOS 1903’s average altitude, there are currently 103 active payloads and 12 tracked debris or rocket body fragments. With an inclination of 69.0°, COSMOS 1903 passes over latitudes between 69.0°N and 69.0°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 1,536 active satellites in total, of which 54 share a similar altitude band with COSMOS 1903.