NAVSTAR 55 (USA 178)

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NAVSTAR 55 (USA 178) is classified as:

• Global Positioning System (GPS) Operational
• Global Positioning System (GPS) Constellation

NORAD ID: 28361
Int'l Code: 2004-023A
Perigee: 19,850.1 km
Apogee: 20,529.1 km
Inclination: 54.1 °
Period: 718.0 minutes
Semi major axis: 26560 km
RCS: 3.1622 m² (large)
Launch date: June 23, 2004
Source: United States (US)
Launch site: AIR FORCE EASTERN TEST RANGE (AFETR)
PRN: 23

NAVSTAR 55, also known as USA 178, and as GPS 2R-12, is an American navigational satellite in the GPS fleet that was launched from Cape Canaveral by a Delta 2 rocket at 22:54 UT on 23 June 2004. The 2.1 tonne satellite will soon be manuevered into Slot 4 in Plane F to replace the aging GPS 2A-16 that was launched in November 1992. (GPS 2A-16 will however be repositioned in the same Plane as a backup, till its failue.

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1 28361U 04023A   18323.83406751 +.00000060 +00000-0 +00000-0 0  9996
2 28361 054.0512 198.7785 0127822 227.8274 085.8110 02.00560866105550

Source of the keplerian elements: AFSPC