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NAVSTAR 55 (USA 178)

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NAVSTAR 55 (USA 178) is classified as:


NORAD ID: 28361
Int'l Code: 2004-023A
Perigee: 19,879.4 km
Apogee: 20,501.2 km
Inclination: 54.1 °
Period: 718.0 minutes
Semi major axis: 26561 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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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 28361U 04023A   17111.93779678 -.00000018 +00000-0 +00000-0 0  9996
2 28361 054.1183 222.2467 0117041 218.9501 068.4928 02.00552893093989
Source of the keplerian elements: AFSPC