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| Mission type | Weather |
|---|---|
| Operator | NASA |
| COSPAR ID | 1967-006A |
| SATCAT no. | S02657 |
| Spacecraft properties | |
| Launch mass | 290 kg (640 lb) |
| Start of mission | |
| Launch date | 21 January 1967, 17:31 GMT |
| Rocket | Thor-Delta E |
| Launch site | Vandenberg Space Launch Complex 2 |
| Entered service | 21 January 1967 |
| End of mission | |
| Deactivated | 5 May 1968 |
| Orbital parameters | |
| Reference system | Geocentric orbit |
| Regime | Low Earth orbit |
| Eccentricity | 0.00740 |
| Perigee altitude | 1,338 km (831 mi) |
| Apogee altitude | 1,443 km (897 mi) |
| Inclination | 102° |
| Period | 113.48 minutes |
ESSA program | |
ESSA-4 (or TOS-B) was a spin-stabilized operational meteorological satellite. Its name was derived from that of its oversight agency, the Environmental Science Services Administration (ESSA).