ESSA-1

ESSA-1 (or OT-3) was a spin-stabilized operational meteorological satellite. Its name was derived from that of its oversight agency, the Environmental Science Services Administration (ESSA).

== Launch == left|thumb|220x220px|Delta rocket launching ESSA 1 ESSA-1 was launched on February 3, 1966, at 07:41 UTC. It was launched atop a Delta rocket from Cape Canaveral, Florida. The spacecraft had a mass of at the time of launch. ESSA-1 had an inclination of 97.91°, and an orbited the Earth once every 100 minutes. Its perigee was and its apogee was .