| ESSA-2 | |
| Mission Type: | Weather satellite |
| Operator: | ESSA/NASA |
| Cospar Id: | 1966-016A |
| Satcat: | 2091 |
| Manufacturer: | RCA Astro |
| Launch Mass: | [1] |
| Launch Date: | UTC[2] |
| Launch Rocket: | Delta E |
| Launch Site: | Cape Canaveral LC-17B |
| Disposal Type: | Decommissioned |
| Orbit Epoch: | February 28, 1966 |
| Orbit Reference: | Geocentric |
| Orbit Regime: | Low Earth |
| Orbit Periapsis: | 1355km (842miles) |
| Orbit Apoapsis: | 1415km (879miles) |
| Orbit Inclination: | 101.3° |
| Orbit Semimajor: | 7115.6km (4,421.4miles) |
| Orbit Eccentricity: | 0.00399 |
| Orbit Period: | 113.5 minutes |
| Apsis: | gee |
| Programme: | TOS |
| Previous Mission: | ESSA-1 |
| Next Mission: | ESSA-3 |
ESSA-2 (or OT-2) was a spin-stabilized operational meteorological satellite. Its name was derived from that of its oversight agency, the Environmental Science Services Administration (ESSA).
ESSA-2 was launched on February 28, 1966, at 13:55 UTC. It was launched atop a Delta rocket from Cape Canaveral, Florida. The spacecraft had a mass of 132kg (291lb) at the time of launch. ESSA-2 had an inclination of 101.3°, and an orbited the Earth once every 113 minutes. Its perigee was 1355km (842miles) and its apogee was 1455km (904miles).
ESSA-2 was a Sun-synchronous polar-orbiting weather satellite whose mission was to provide real-time pictures of cloud cover using the automatic picture transmission system. These cloud cover pictures were used by meteorologists for use in weather forecasting and analysis. The satellite provided useful cloud pictures for more than four years before the camera systems were placed in standby mode on March 20, 1970. ESSA-2 was fully deactivated on October 16, 1970.[1]