 A Block IIR GPS satellite | |
| Mission type | Navigation |
|---|---|
| Operator | US Air Force |
| COSPAR ID | 2004-023A[1] |
| SATCATno. | 28361[1] |
| Mission duration | 10 years (planned) 15 years 8 months (achieved) |
| Spacecraft properties | |
| Spacecraft type | GPS Block IIR[2] |
| Bus | AS-4000[2] |
| Manufacturer | Lockheed Martin[2] |
| Launch mass | 2,032 kilograms (4,480 lb)[2] |
| Start of mission | |
| Launch date | 23 June 2004, 22:54:00 (2004-06-23UTC22:54Z) UTC |
| Rocket | Delta II 7925-9.5, D305[3] |
| Launch site | Cape CanaveralSLC-17B[3] |
| End of mission | |
| Deactivated | 2 March 2020 (2020-03-03) |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Medium Earth (Semi-synchronous) |
| Perigee altitude | 20,089 kilometres (12,483 mi)[4] |
| Apogee altitude | 20,277 kilometres (12,600 mi)[4] |
| Inclination | 55 degrees[4] |
| Period | 718 minutes[4] |
USA-178, also known asGPS IIR-12 andGPS SVN-60, is an Americannavigation satellite which forms part of theGlobal Positioning System. It was the twelfthBlock IIR GPS satellite to be launched, out of thirteen in the original configuration, and twenty oneoverall. It was built byLockheed Martin, using theAS-4000satellite bus.[2]
USA-178 was launched at 22:54:00 UTC on 23 June 2004, atop aDelta II carrier rocket, flight number D305, flying in the 7925–9.5 configuration.[3] The launch took place fromSpace Launch Complex 17B at theCape Canaveral Air Force Station,[5] and placed USA-178 into a transfer orbit. The satellite raised itself intomedium Earth orbit using aStar-37FMapogee motor.[2]
By 23 August 2004, USA-178 was in an orbit with aperigee of 20,089 kilometres (12,483 mi), anapogee of 20,277 kilometres (12,600 mi), aperiod of 718 minutes, and 55 degrees ofinclination to the equator.[4] It is used to broadcast the PRN 23 signal, and operates in slot 4 of plane F of the GPS constellation. The satellite has a mass of 2,032 kilograms (4,480 lb), and a design life of 10 years.[2] As of March 2020 it is no longer in service.
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