USA-79

USA-79
NamesNavstar 2A-03
GPS IIA-3
GPS II-12
GPS SVN-25
Mission typeNavigation
OperatorU.S. Air Force
COSPAR ID1992-009A [1]
SATCAT no.21890
Mission duration7.5 years (planned)
17.75 years (achieved)
Spacecraft properties
SpacecraftGPS-IIA
Spacecraft typeGPS Block IIA[2]
ManufacturerRockwell International
Launch mass840 kg (1,850 lb)
Dimensions5.3 m (17 ft) of long
Power710 watts
Start of mission
Launch date23 February 1992, 22:29:00 UTC
RocketDelta II 7925-9.5
(Delta D207)
Launch siteCape Canaveral, LC-17B
ContractorMcDonnell Douglas
Entered service27 March 1992
End of mission
DisposalGraveyard orbit
Deactivated18 December 2009
Orbital parameters
Reference systemGeocentric orbit[3]
RegimeMedium Earth orbit
(Semi-synchronous)
SlotA2 (slot 2 plane A)
Perigee altitude19,913 km (12,373 mi)
Apogee altitude20,318 km (12,625 mi)
Inclination54.70°
Period714.70 minutes
← USA-71 (GPS IIA-2)
USA-80 (GPS IIA-4) →

USA-79, also known as GPS IIA-3, GPS II-12 and GPS SVN-25, was an American navigation satellite which formed part of the Global Positioning System. It was the third of nineteen Block IIA GPS satellites to be launched.

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