SKYNET 4E

SKYNET 4E is an active satellite operated by Ministry of Defense (United Kingdom), launched on 1999-02-26 from Guiana Space Centre, Kourou. With over 27 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Geostationary Orbit (GEO) at altitudes between 36,134 km and 36,144 km with an inclination of 12.1°. It travels at approximately 11,024 km/h (3.06 km/s), completing one full orbit every 24.2 hours — that’s roughly 0.99 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 SKYNET 4E in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

SKYNET 4E 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. With an inclination of 12.1°, it traces a small figure-of-eight pattern relative to the equator rather than remaining perfectly stationary, which can indicate aging stationkeeping fuel or a deliberate inclined-orbit strategy. Within ±50 km of SKYNET 4E’s average altitude, there are currently 185 active payloads and 8 tracked debris or rocket body fragments. United Kingdom operates approximately 720 active satellites in total, of which 3 share a similar altitude band with SKYNET 4E.