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 145 kilograms (320 lb) 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 1,361 kilometers (846 mi) and its apogee was 1,423 kilometers (884 mi).