NAVSTAR 23 (USA 71)

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NAVSTAR 23 (USA 71) is classified as:

• Global Positioning System (GPS) Constellation

NORAD ID: 21552
Int'l Code: 1991-047A
Perigee: 20,897.2 km
Apogee: 21,076.6 km
Inclination: 54.9 °
Period: 750.6 minutes
Semi major axis: 27357 km
RCS: 3.8853 m² (large)
Launch date: July 4, 1991
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.

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1 21552U 91047A   18227.79258437 -.00000053 +00000-0 +00000-0 0  9990
2 21552 054.9437 095.2854 0032786 084.4628 229.0181 01.91857612196469

Source of the keplerian elements: AFSPC