USA-79
| Names | Navstar 2A-03 GPS IIA-3 GPS II-12 GPS SVN-25 |
|---|---|
| Mission type | Navigation |
| Operator | U.S. Air Force |
| COSPAR ID | 1992-009A |
| SATCAT no. | 21890 |
| Mission duration | 7.5 years (planned) 17.75 years (achieved) |
| Spacecraft properties | |
| Spacecraft | GPS-IIA |
| Spacecraft type | GPS Block IIA |
| Manufacturer | Rockwell International |
| Launch mass | 840 kg (1,850 lb) |
| Dimensions | 5.3 m (17 ft) of long |
| Power | 710 watts |
| Start of mission | |
| Launch date | 23 February 1992, 22:29:00 UTC |
| Rocket | Delta II 7925-9.5 (Delta D207) |
| Launch site | Cape Canaveral, LC-17B |
| Contractor | McDonnell Douglas |
| Entered service | 27 March 1992 |
| End of mission | |
| Disposal | Graveyard orbit |
| Deactivated | 18 December 2009 |
| Orbital parameters | |
| Reference system | Geocentric orbit |
| Regime | Medium Earth orbit (Semi-synchronous) |
| Slot | A2 (slot 2 plane A) |
| Perigee altitude | 19,913 km (12,373 mi) |
| Apogee altitude | 20,318 km (12,625 mi) |
| Inclination | 54.70° |
| Period | 714.70 minutes |
USA-79, also known as GPS IIA-3, GPS II-12 and GPS SVN-25, was an American navigation satellite which formed part of the Global Positioning System. It was the third of nineteen Block IIA GPS satellites to be launched.