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Mission typeNavigation
OperatorUS Air Force
COSPAR ID1985-093A[1]
SATCAT no.16129[1]
Mission duration5 years (planned)
8 12 years (achieved)
Spacecraft properties
Spacecraft typeGPS Block I
Launch mass759 kilograms (1,673 lb)[2]
Start of mission
Launch date9 October 1985, 02:53 (1985-10-09UTC02:53Z) UTC
RocketAtlas E/F SGS-2, 55E[3]
Launch siteVandenberg SLC-3W[3]
End of mission
Deactivated14 April 1994 (1994-04-15)
Orbital parameters
Reference systemGeocentric
RegimeMedium Earth
Perigee altitude19,821 kilometres (12,316 mi)[4]
Apogee altitude20,542 kilometres (12,764 mi)[4]
Inclination63.3 degrees[4]
Period717.94 minutes[4]

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.[2]

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.[3] The launch took place from Space Launch Complex 3W at Vandenberg Air Force Base,[5] and placed USA-10 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-27 apogee motor.[2]

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.[4] The satellite had a design life of 5 years and a mass of 758 kilograms (1,671 lb).[2] It broadcast the PRN 03 signal in the GPS demonstration constellation, and was retired from service on 14 April 1994.


  1. ^ a b "Navstar 11". US National Space Science Data Center. Retrieved 25 June 2012.
  2. ^ a b c d e Krebs, Gunter. "GPS (Navstar)". Gunter's Space Page. Retrieved 12 July 2012.
  3. ^ a b c McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 12 July 2012.
  4. ^ a b c d e McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 12 July 2012.
  5. ^ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 12 July 2012.