From Wikipedia, the free encyclopedia
Jump to navigation Jump to search
Mission typeNavigation
OperatorUS Air Force
COSPAR ID1993-042A[1]
SATCAT no.22700[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 date26 June 1993, 13:27:00 (1993-06-26UTC13:27Z) UTC
RocketDelta II 7925-9.5, D221[3]
Launch siteCape Canaveral LC-17A[3]
End of mission
DisposalPlaced in a graveyard orbit
Deactivated19 May 2014, 22:00:00 (2014-05-19UTC23Z) UTC
Orbital parameters
Reference systemGeocentric
RegimeMedium Earth
Perigee altitude20,120 kilometres (12,500 mi)[4]
Apogee altitude20,244 kilometres (12,579 mi)[4]
Inclination54.7 degrees[4]
Period717.96 minutes[4]

USA-92, also known as GPS IIA-12, GPS II-21, GPS SVN-39, and NAVSTAR 39, is an American navigation satellite which forms part of the Global Positioning System. It was the twelfth of nineteen Block IIA GPS satellites to be launched.

USA-92 was launched at 13:27:00 UTC on 26 June 1993, atop a Delta II carrier rocket, flight number D221, 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-92 into a transfer orbit. The satellite raised itself into medium Earth orbit using a Star-37XFP apogee motor.[2]

On 27 July 1993, USA-92 was in an orbit with a perigee of 20,120 kilometres (12,500 mi), an apogee of 20,244 kilometres (12,579 mi), a period of 717.96 minutes, and 54.7 degrees of inclination to the equator.[4] It broadcasts the PRN 09 signal, and operates in slot 1 of plane A of the GPS constellation.[6] The satellite has a mass of 1,816 kilograms (4,004 lb). It had a design life of 7.5 years;[2] however, it was kept in service for over 20 years before finally decommissioned from service on May 19, 2014.[7]

Following decommissioning, it was subsequently placed in a disposal orbit approximately 1000 km above the operational constellation on September 21, 2015.[8]


  1. ^ a b "Navstar 2A-12". 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.
  7. ^ "NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2014046". United States Coast Guard. Retrieved 21 May 2014.
  8. ^ "2 SOPS adapts new disposal approval process". United States Air Force. Retrieved 31 October 2015.[permanent dead link]