SS 2

SS 2 is an active satellite operated by NRO / NRL (United States), launched on 1977-12-08 from Vandenberg Space Force Base, United States on the PARCAE 2 launch. With over 49 years in orbit, it has far exceeded many satellites’ design lifetimes. It orbits in Low Earth Orbit (LEO) at altitudes between 557 km and 1,290 km with an inclination of 63.3°. It travels at approximately 26,612 km/h (7.39 km/s), completing one full orbit every 104 minutes — that’s roughly 13.91 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~100–500 years. Orbital Radar tracks SS 2 in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

SS 2 orbits at an average altitude of 924 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 2’s average altitude, there are currently 288 active payloads and 1,378 tracked debris or rocket body fragments. With an inclination of 63.3°, SS 2 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 13,204 active satellites in total, of which 144 share a similar altitude band with SS 2.