USA-177
 A Block IIR GPS satellite | |
| Mission type | Navigation |
|---|---|
| Operator | US Air Force |
| COSPAR ID | 2004-009A[1] |
| SATCATno. | 28190[1] |
| Mission duration | 10 years (planned)[2] |
| 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 | 20 March 2004, 17:53:00UTC |
| Rocket | Delta II7925-9.5,D303[3] |
| Launch site | Cape CanaveralSLC-17B[3] |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Medium Earth (Semi-synchronous) |
| Perigee altitude | 20,095 kilometres (12,486 mi)[4] |
| Apogee altitude | 20,271 kilometres (12,596 mi)[4] |
| Inclination | 55 degrees[4] |
| Period | 718 minutes[4] |
USA-177,also known asGPS IIR-11andGPS SVN-59,is an Americannavigation satellitewhich forms part of theGlobal Positioning System.It was the eleventhBlock IIRGPS 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-177 was launched at 17:53:00 UTC on 20 March 2004, atop aDelta IIcarrier rocket, flight number D303, flying in the 7925-9.5 configuration.[3]The launch took place fromSpace Launch Complex 17Bat theCape Canaveral Air Force Station,[5]and placed USA-177 into a transfer orbit. The satellite raised itself intomedium Earth orbitusing aStar-37FMapogee motor.[2]
By 20 May 2004, USA-177 was in an orbit with aperigeeof 20,095 kilometres (12,486 mi), anapogeeof 20,271 kilometres (12,596 mi), aperiodof 718 minutes, and 55 degrees ofinclinationto the equator.[4]It is used to broadcast the PRN 19 signal, and operates in slot 3 of plane C 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 2012 it remains in service.
References
[edit]- ^ab"Navstar 54".US National Space Science Data Center.Retrieved11 July2012.
- ^abcdefghKrebs, Gunter."GPS-2R (Navstar-2R)".Gunter's Space Page.Retrieved11 July2012.
- ^abcMcDowell, Jonathan."Launch Log".Jonathan's Space Page.Retrieved11 July2012.
- ^abcdeMcDowell, Jonathan."Satellite Catalog".Jonathan's Space Page.Retrieved11 July2012.
- ^McDowell, Jonathan."Launch List".Launch Vehicle Database.Jonathan's Space Page. Archived fromthe originalon 15 August 2020.Retrieved11 July2012.
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