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Mission typeNavigation
OperatorUS Air Force
COSPAR ID1984-097A[1]
SATCAT no.15271[1]
Mission duration5 years (planned)
11 12 years (achieved)
Spacecraft properties
Spacecraft typeGPS Block I
Launch mass759 kilograms (1,673 lb)[2]
Start of mission
Launch date8 September 1984, 21:41 (1984-09-08UTC21:41Z) UTC
RocketAtlas E/F SGS-2, 14E[3]
Launch siteVandenberg SLC-3W[3]
End of mission
Deactivated26 March 1996 (1996-03-27)
Orbital parameters
Reference systemGeocentric
RegimeMedium Earth
Perigee altitude19,961 kilometres (12,403 mi)[4]
Apogee altitude20,404 kilometres (12,678 mi)[4]
Inclination63.2 degrees[4]
Period717.98 minutes[4]

USA-5, also known as Navstar 10, GPS I-10 and GPS SVN-10, was an American navigation satellite launched in 1984 as part of the Global Positioning System development programme. It was the tenth of eleven Block I GPS satellites to be launched.[2]

USA-5 was launched at 21:41 UTC on 8 September 1984, atop an Atlas E/F carrier rocket with an SGS-2 upper stage. The Atlas used had the serial number 14E, 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-5 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-27 apogee motor.[2]

By 8 October 1984, USA-5 had been raised to an orbit with a perigee of 19,961 kilometres (12,403 mi), an apogee of 20,404 kilometres (12,678 mi), a period of 717.98 minutes, and 63.2 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 12 signal in the GPS demonstration constellation, and was retired from service on 26 March 1996. It was the last Block I satellite to be decommissioned.


  1. ^ a b "Navstar 10". 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.