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Mission typeNavigation
OperatorUS Air Force
COSPAR ID1993-017A[1]
SATCAT no.22581[1]
Mission duration7.5 years (planned)[2]
Spacecraft properties
Spacecraft typeGPS Block IIA[2]
Launch mass1,816 kilograms (4,004 lb)[2]
Start of mission
Launch date30 March 1993, 03:09:00 (1993-03-30UTC03:09Z) UTC
RocketDelta II 7925-9.5, D219[3]
Launch siteCape Canaveral LC-17A[3]
End of mission
Deactivated24 October 2005 (2005-10-25)
Orbital parameters
Reference systemGeocentric
RegimeMedium Earth
Perigee altitude20,076 kilometres (12,475 mi)[4]
Apogee altitude20,287 kilometres (12,606 mi)[4]
Inclination54.9 degrees[4]
Period717.96 minutes[4]

USA-90, also known as GPS IIA-10, GPS II-19 and GPS SVN-31, was an American navigation satellite which formed part of the Global Positioning System. It was the tenth of nineteen Block IIA GPS satellites to be launched.

USA-90 was launched at 03:09:00 UTC on 30 March 1993, atop a Delta II carrier rocket, flight number D219, flying in the 7925-9.5 configuration.[3] The launch took place from Launch Complex 17A at the Cape Canaveral Air Force Station,[5] and placed USA-90 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37XFP apogee motor.[2]

On 2 May 1993, USA-90 was in an orbit with a perigee of 20,076 kilometres (12,475 mi), an apogee of 20,287 kilometres (12,606 mi), a period of 717.96 minutes, and 54.9 degrees of inclination to the equator.[4] It broadcast PRN 31, and operated in slot 3 of plane C of the GPS constellation.[6] The satellite had a mass of 1,816 kilograms (4,004 lb). It had a design life of 7.5 years,[2] and ceased operations on 24 October 2005.


  1. ^ a b "Navstar 2A-10". US National Space Science Data Center. Retrieved 10 July 2012.
  2. ^ a b c d e f Krebs, Gunter. "GPS-2A (Navstar-2A)". Gunter's Space Page. Retrieved 10 July 2012.
  3. ^ a b c McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 10 July 2012.
  4. ^ a b c d e McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 10 July 2012.
  5. ^ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 10 July 2012.
  6. ^ Wade, Mark. "Navstar". Encyclopedia Astronautica. Retrieved 10 July 2012.