ESSA-5 (or TOS-C) was a spin-stabilized operational meteorological satellite. Its name was derived from that of its oversight agency, the Environmental Science Services Administration (ESSA).
ESSA-5 was launched on April 20, 1967, at 11:17 UTC. It was launched atop a Delta rocket from Vandenberg Air Force Base, California, U.S.. The spacecraft had a mass of 145kg (320lb) at the time of launch. ESSA-5 had an inclination of 101.9°, and an orbited the Earth once every 113.6 minutes. Its perigee was 1361km (846miles) and its apogee was 1423km (884miles).