ASTRA 4A (SIRIUS 4)

ASTRA 4A (SIRIUS 4) is an active satellite operated by SES S.A. (SES), launched on 2007-11-17 from Baikonur, Kazakhstan. After 19 years in orbit, it continues to be tracked by global surveillance networks. It orbits in Geostationary Orbit (GEO) at altitudes between 35,777 km and 35,796 km with an inclination of 0.0°. It travels at approximately 11,070 km/h (3.07 km/s), completing one full orbit every ~24 hours (geosynchronous) — that’s roughly 1.00 orbits per day. At geostationary altitude, there is no meaningful atmospheric drag — this object will remain in orbit indefinitely unless actively deorbited. Orbital Radar tracks ASTRA 4A (SIRIUS 4) in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

ASTRA 4A (SIRIUS 4) occupies geostationary orbit at approximately 35,786 km above the equator, where its orbital period matches the Earth’s 24-hour rotation. From the ground, it appears to hover over a fixed point — ideal for broadcast television, weather monitoring and wideband communications. Within ±50 km of ASTRA 4A (SIRIUS 4)’s average altitude, there are currently 713 active payloads and 58 tracked debris or rocket body fragments — notable neighbours include ASTRA 1N, GOES 16, TDRS 13. SES operates approximately 77 active satellites in total, of which 36 share a similar altitude band with ASTRA 4A (SIRIUS 4).