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NAVSTAR 21 (USA 64)

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    NAVSTAR 21 (USA 64) can be found in the following categories:
    GPS Operational

    NORAD ID: 20830
    Int'l Code: 1990-088A
    Perigee: 21,333.7 km
    Apogee: 21,434.4 km
    Inclination: 54.0 °
    Period: 767.0 minutes
    Semi major axis: 27755 km
    Launch date: October 1, 1990
    Source: United States (US)
    PRN:
    Comments: Global Positioning System (GPS) was developed by the US Department of Defense to provide all-weather round-the-clock navigation capabilities for military ground, sea, and air forces. Since its implementation, GPS has also become an integral asset in numerous civilian applications and industries around the globe, including recreational used (e.g., boating, aircraft, hiking), corporate vehicle fleet tracking, and surveying. GPS employs 24 spacecraft in 20,200 km circular orbits inclined at 55 degrees. These vehicles are placed in 6 orbit planes with four operational satellites in each plane.

    Two Line Element Set (TLE):

    1 20830U 90088A   14297.01481025  .00000071  00000-0  00000+0 0  3342
    2 20830 053.9802 157.9149 0018151 201.9921 132.0615 01.87754281172986
    
    
    Source: AFSPC

    NASA's NSSDC Master Catalog entry for NAVSTAR 21 (USA 64)

     
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