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USA 264

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USA 264 is classified as:


NORAD ID: 40964
Int'l Code: 2015-058A
Perigee: 1,083.1 km
Apogee: 1,143.7 km
Inclination: 63.4 °
Period: 107.4 minutes
Semi major axis: 7484 km
RCS: Unknown
Launch date: October 8, 2015
Source: United States (US)
Launch site: AIR FORCE WESTERN TEST RANGE (AFWTR)

USA 264 (NROL-55) is military satellite operated by National Reconnaissance Office (NRO). The nature of this satellite is classified.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 40964U 15058A   21012.20144829 0.00000000  00000-0  00000-0 0    01
2 40964  63.4355  80.2730 0040500  10.5789 349.4273 13.40817877    08
Source of the keplerian elements: McCants