COSMOS 2503

COSMOS 2503 is an active satellite operated by Ministry of Defense (Russia (CIS)), launched on 2015-02-27 from PKMTR on the Bars-M No. 1L launch. After 11 years in orbit, it continues to be tracked by global surveillance networks. It orbits in Low Earth Orbit (LEO) at altitudes between 534 km and 558 km with an inclination of 97.8°. It travels at approximately 27,328 km/h (7.59 km/s), completing one full orbit every 96 minutes — that’s roughly 15.07 orbits per day. Its near-polar, sun-synchronous orbit means it passes over any given point on Earth at approximately the same local solar time, ideal for consistent Earth observation lighting conditions. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~3–10 years. Orbital Radar tracks COSMOS 2503 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

COSMOS 2503 orbits at an average altitude of 546 km in a sun-synchronous orbit (SSO), a specialised subset of LEO where the orbital plane precesses to maintain a constant angle relative to the Sun. This provides consistent lighting conditions on every pass — essential for Earth observation, weather monitoring and environmental science. Within ±50 km of COSMOS 2503’s average altitude, there are currently 2,537 active payloads and 351 tracked debris or rocket body fragments — notable neighbours include STARLINK-1184, STARLINK-1276, STARLINK-1451. This makes it one of the more crowded altitude bands, containing roughly 14.2% of all active satellites. With an inclination of 97.8°, COSMOS 2503 passes over latitudes between 97.8°N and 97.8°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 1,302 active satellites in total, of which 52 share a similar altitude band with COSMOS 2503.