NAVSTAR 21 (USA 64)

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NAVSTAR 21 (USA 64) is classified as:

Global Positioning System (GPS) Constellation

NORAD ID: 20830

Int'l Code: 1990-088A

Perigee: 21,322.1 km

Apogee: 21,446.3 km

Inclination: 55.5 °

Period: 767.0 minutes

Semi major axis: 27755 km

RCS: 2.1514 m² (large)

Launch date: October 1, 1990
Source: United States (US)
Launch site: AIR FORCE EASTERN TEST RANGE (AFETR)

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.

1 20830U 90088A   22141.09037291 -.00000065  00000-0  00000-0 0  9991
2 20830  55.5006  60.6822 0022384 267.0422 276.6792  1.87753015224860

Source of the keplerian elements: AFSPC