USA-66

USA-66
NamesNavstar 2A-01
GPS IIA-1
GPS II-10
GPS SVN-23
Mission typeNavigation
OperatorU.S. Air Force
COSPAR ID1990-103A[1]
SATCAT no.20959
Mission duration7.5 years (planned)
25 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 date26 November 1990,
21:39:01 UTC
RocketDelta II 7925-9.5
(Delta D201)[3]
Launch siteCape Canaveral, LC-17A
ContractorMcDonnell Douglas
Entered service30 December 1990
End of mission
DisposalGraveyard orbit
Deactivated25 January 2016[4]
Orbital parameters
Reference systemGeocentric orbit[5]
RegimeMedium Earth orbit
(Semi-synchronous)
SlotE5 (slot 5 plane E)
Perigee altitude19,935 km (12,387 mi)
Apogee altitude20,279 km (12,601 mi)
Inclination54.8°
Period714.8 minutes
← USA-64 (GPS II-9)
USA-71 (GPS IIA-2) →

USA-66, also known as GPS IIA-1, GPS II-10 and GPS SVN-23, was an American navigation satellite which formed part of the Global Positioning System. It was the first of nineteen Block IIA GPS satellites to be launched, and was the oldest GPS satellite still in operation until its decommissioning on 25 January 2016.[4]

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