USA-79
 A Block IIA GPS satellite |
|
| Operator | US Air Force |
|---|---|
| Major contractors | Rockwell[1] |
| Bus | GPS Block IIA[1] |
| Mission type | Navigation |
| Launch date | 23 February 1992, 22:29:00 UTC |
| Carrier rocket | Delta II 7925-9.5[2] D207[2] |
| Launch site | Cape Canaveral LC-17B[2] |
| Mission duration | 7.5 years (planned)[1] |
| Ceased operations | 18 December 2009 |
| COSPAR ID | 1992-009A[3] |
| SATCAT | 21890[3] |
| Mass | 1,816 kilograms (4,000 lb)[1] |
| Orbital elements | |
| Regime | Semisynchronous medium Earth |
| Inclination | 54.7°[4] |
| Apoapsis | 20,343 kilometres (12,641 mi)[4] |
| Periapsis | 20,018 kilometres (12,439 mi)[4] |
| Orbital period | 717.9 minutes[4] |
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.
USA-79 was launched at 22:29:00 UTC on 23 February 1992, atop a Delta II carrier rocket, flight number D207, flying in the 7925-9.5 configuration.[2] The launch took place from Launch Complex 17B at the Cape Canaveral Air Force Station,[5] and placed USA-79 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37XFP apogee motor.[1]
On 27 March 1992, USA-79 was in an orbit with a perigee of 20,018 kilometres (12,439 mi), an apogee of 20,343 kilometres (12,641 mi), a period of 717.9 minutes, and 54.7 degrees of inclination to the equator.[4] It had PRN 25, and operated in slot 2 of plane A of the GPS constellation.[6] The satellite had a mass of 1,816 kilograms (4,000 lb). It had a design life of 7.5 years,[1] and ceased operations on 18 December 2009.
References [edit]
- ^ a b c d e f Krebs, Gunter. "GPS-2A (Navstar-2A)". Gunter's Space Page. Retrieved 10 July 2012.
- ^ a b c d McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 10 July 2012.
- ^ a b "Navstar 2A-03". US National Space Science Data Center. Retrieved 10 July 2012.
- ^ a b c d e McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 10 July 2012.
- ^ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 10 July 2012.
- ^ Wade, Mark. "Navstar". Encyclopedia Astronautica. Retrieved 10 July 2012.
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