OPS 4947 (TRANSIT 17)

OPS 4947 (TRANSIT 17) is an active satellite operated by USN NAVAIR (United States), launched on 1967-09-25 from Vandenberg Space Force Base, United States on the NNS O-14 launch. After more than 59 years in orbit, it is one of the longest-surviving objects in the space catalogue. It orbits in Low Earth Orbit (LEO) at altitudes between 1,023 km and 1,096 km with an inclination of 89.3°. It travels at approximately 26,367 km/h (7.32 km/s), completing one full orbit every 106 minutes — that’s roughly 13.54 orbits per day. At its current altitude, the estimated orbital lifetime before atmospheric re-entry is ~500–1,000 years. Orbital Radar tracks OPS 4947 (TRANSIT 17) in real time using the latest two-line element set (TLE) data, providing live position, altitude, speed and orbital path updated continuously.

OPS 4947 (TRANSIT 17) orbits at an average altitude of 1,060 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 OPS 4947 (TRANSIT 17)’s average altitude, there are currently 309 active payloads and 605 tracked debris or rocket body fragments — notable neighbours include ONEWEB-0041. With an inclination of 89.3°, OPS 4947 (TRANSIT 17) passes over latitudes between 89.3°N and 89.3°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. United States operates approximately 13,279 active satellites in total, of which 42 share a similar altitude band with OPS 4947 (TRANSIT 17).