SS 1

SS 1 is an active satellite operated by United States, launched on 1977-12-08 from Vandenberg SFB, California. With over 49 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Low Earth Orbit (LEO) at altitudes between 552 km and 1,303 km with an inclination of 63.3°. It travels at approximately 26,604 km/h (7.39 km/s), completing one full orbit every 104 minutes — that’s roughly 13.90 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~100–500 years. Orbital Radar tracks SS 1 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

SS 1 orbits at an average altitude of 928 km in the upper LEO band, where atmospheric drag is negligible and objects can persist for centuries to millennia. This altitude is used by broadband constellations like OneWeb and by scientific missions requiring stable orbits far from the densest debris bands. Within ±50 km of SS 1’s average altitude, there are currently 253 active payloads and 1,148 tracked debris or rocket body fragments. With an inclination of 63.3°, SS 1 passes over latitudes between 63.3°N and 63.3°S, covering most populated land masses in both hemispheres. This mid-inclination band balances global coverage with efficient launch energy requirements. United States operates approximately 12,360 active satellites in total, of which 87 share a similar altitude band with SS 1.