Tracking 17938 objects as of 23-February-2017
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NAVSTAR 55 (USA 178)

NAVSTAR 55 (USA 178) is classified as:

NORAD ID: 28361
Int'l Code: 2004-023A
Launch date: June 23, 2004
Source: United States (US)
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):

Source of the keplerian elements: AFSPC