USA-145
US Air Force | |
| COSPAR ID | 1999-055A[1] |
|---|---|
| SATCAT no. | 25933[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 | 7 October 1999, 12:51:01 UTC |
| Rocket | SLC-17A[3] |
| Orbital parameters | |
| Reference system | Geocentric |
| Regime | Medium Earth (Semi-synchronous) |
| Perigee altitude | 20,096 kilometers (12,487 mi)[4] |
| Apogee altitude | 20,267 kilometers (12,593 mi)[4] |
| Inclination | 53 degrees[4] |
| Period | 717.96 minutes[4] |
USA-145, also known as GPS IIR-3 and GPS SVN-46, is an American
USA-145 was launched at 12:51:01 UTC on 7 October 1999, atop a
apogee motor.[2]
By 10 November 1999, USA-145 was in an orbit with a
inclination to the equator.[4] It is used to broadcast the PRN 11 signal, and operated in slot 2 of plane D of the GPS constellation;[6] however, it had been moved to slot 5 by 2011, with USA-71 covering slot 2. The satellite has a mass of 2,032 kilograms (4,480 lb), and a design life of 10 years.[2]
As of 2019 it remains in service.
GPS IIR-3 was originally intended to use satellite SVN-50; however, it was damaged during launch preparations in May 1999 after rainwater leaked into the cleanroom atop SLC-17A where the satellite was being attached to its rocket.[6] SVN-50 was repaired and launched as GPS IIR-21, becoming the last IIR to fly.
References
- ^ a b "Navstar 46". US National Space Science Data Center. Retrieved 11 July 2012.
- ^ a b c d e f g h Krebs, Gunter. "GPS-2R (Navstar-2R)". Gunter's Space Page. Retrieved 11 July 2012.
- ^ a b c McDowell, Jonathan. "Launch Log". Jonathan's Space Page. Retrieved 11 July 2012.
- ^ a b c d e McDowell, Jonathan. "Satellite Catalog". Jonathan's Space Page. Retrieved 11 July 2012.
- ^ McDowell, Jonathan. "Launch List". Launch Vehicle Database. Jonathan's Space Page. Retrieved 11 July 2012.
- ^ a b Wade, Mark. "Navstar". Encyclopedia Astronautica. Archived from the original on November 11, 2002. Retrieved 11 July 2012.
 | This article about one or more spacecraft of the United States is a stub. You can help Wikipedia by expanding it. |