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USA 75

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USA 75 is classified as:


NORAD ID: 21805
Int'l Code: 1991-080B
Perigee: 36,068.5 km
Apogee: 36,134.3 km
Inclination: 15.0 °
Period: 1,451.8 minutes
Semi major axis: 42472 km
RCS: Unknown
Launch date: November 24, 1991
Source: United States (US)
Launch site: AIR FORCE EASTERN TEST RANGE (AFETR)

Infrared sensors to detect heat from missile and booster plumes against earth's background; detection capability of smaller missiles; improved warning of attack by short-range missiles against U.S. and allied forces.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 21805U 91080B   20266.40470182 -.00000078 +00000-0 +00000-0 0  9992
2 21805 015.0454 001.6200 0007750 041.1076 015.0328 00.99184298004940
Source of the keplerian elements: McCants