|Operator||US Air Force|
|Mission duration||7.5 years (planned)|
|Spacecraft type||GPS Block IIA|
|Launch mass||1,816 kilograms (4,004 lb)|
|Start of mission|
|Launch date||18 December 1992, 22:16:00UTC|
|Rocket||Delta II 7925-9.5, D217|
|Launch site||Cape Canaveral LC-17B|
|End of mission|
|Deactivated||23 October 2007|
|Perigee||20,037 kilometres (12,450 mi)|
|Apogee||20,326 kilometres (12,630 mi)|
USA-87, also known as GPS IIA-8, GPS II-17 and GPS SVN-29, was an American navigation satellite which formed part of the Global Positioning System. It was the eighth of nineteen Block IIA GPS satellites to be launched.
USA-87 was launched at 22:16:00 UTC on 18 December 1992, atop a Delta II carrier rocket, flight number D217, flying in the 7925-9.5 configuration. The launch took place from Launch Complex 17B at the Cape Canaveral Air Force Station, and placed USA-87 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37XFP apogee motor.
On 25 January 1993, USA-87 was in an orbit with a perigee of 20,037 kilometres (12,450 mi), an apogee of 20,326 kilometres (12,630 mi), a period of 717.94 minutes, and 54.7 degrees of inclination to the equator. It had PRN 29, and operated in slot 5 of plane F of the GPS constellation. The satellite had a mass of 1,816 kilograms (4,004 lb). It had a design life of 7.5 years, and ceased operations on 23 October 2007.
- "Navstar 2A-08". US National Space Science Data Center. Retrieved 10 July 2012.
- Krebs, Gunter. "GPS-2A (Navstar-2A)". Gunter's Space Page. Retrieved 10 July 2012.
- McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 10 July 2012.
- 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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