USA-126
| Names | Navstar 2A-17 GPS IIA-17 GPS II-26 GPS SVN-40 |
|---|---|
| Mission type | Navigation |
| Operator | U.S. Air Force |
| COSPAR ID | 1996-041A |
| SATCAT no. | 23953 |
| Mission duration | 7.5 years (planned) 19.5 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 | 16 July 1996, 00:50:00 UTC |
| Rocket | Delta II 7925-9.5 (Delta D237) |
| Launch site | Cape Canaveral, LC-17A |
| Entered service | 15 August 1996 |
| End of mission | |
| Disposal | Graveyard orbit |
| Deactivated | 11 March 2016 |
| Orbital parameters | |
| Reference system | Geocentric orbit |
| Regime | Medium Earth orbit (Semi-synchronous) |
| Slot | E3 (slot 3 plane E) |
| Perigee altitude | 20,272 km (12,596 mi) |
| Apogee altitude | 20,365 km (12,654 mi) |
| Inclination | 55.03° |
| Period | 723.60 minutes |
USA-126, also known as GPS IIA-17, GPS II-26 and GPS SVN-40, is an American navigation satellite which forms part of the Global Positioning System. It was the seventeenth of nineteen Block IIA GPS satellites to be launched.