|Operator||US Air Force|
|Mission duration||5 years (planned)|
8 1⁄2 years (achieved)
|Spacecraft type||GPS Block I|
|Launch mass||759 kilograms (1,673 lb)|
|Start of mission|
|Launch date||9 October 1985, 02:53UTC|
|Rocket||Atlas E/F SGS-2, 55E|
|Launch site||Vandenberg SLC-3W|
|End of mission|
|Deactivated||14 April 1994|
|Perigee altitude||19,821 kilometres (12,316 mi)|
|Apogee altitude||20,542 kilometres (12,764 mi)|
USA-10, also known as Navstar 11, GPS I-11 and GPS SVN-11, was an American navigation satellite launched in 1985 as part of the Global Positioning System development programme. It was the last of eleven Block I GPS satellites to be launched.
USA-10 was launched at 02:53 UTC on 9 October 1985, atop an Atlas E/F carrier rocket with an SGS-2 upper stage. The Atlas used had the serial number 55E, and was originally built as an Atlas E. The launch took place from Space Launch Complex 3W at Vandenberg Air Force Base, and placed USA-10 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-27 apogee motor.
By 8 November 1985, USA-10 had been raised to an orbit with a perigee of 19,821 kilometres (12,316 mi), an apogee of 20,542 kilometres (12,764 mi), a period of 717.94 minutes, and 63.3 degrees of inclination to the equator. The satellite had a design life of 5 years and a mass of 758 kilograms (1,671 lb). It broadcast the PRN 03 signal in the GPS demonstration constellation, and was retired from service on 14 April 1994.
- "Navstar 11". US National Space Science Data Center. Retrieved 25 June 2012.
- Krebs, Gunter. "GPS (Navstar)". Gunter's Space Page. Retrieved 12 July 2012.
- McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 12 July 2012.
- McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 12 July 2012.
- McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 12 July 2012.
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