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USA 264

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USA 264 is classified as:

NORAD ID: 40964
Int'l Code: 2015-058A
Perigee: 1,061.3 km
Apogee: 1,166.1 km
Inclination: 63.4 °
Period: 107.4 minutes
Semi major axis: 7484 km
RCS: Unknown
Launch date: October 8, 2015
Source: United States (US)

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   17193.86672735 0.00000000  00000-0  00000-0 0    00
2 40964  63.4367  95.4322 0070000 173.9673 186.0327 13.40732328    02
Source of the keplerian elements: McCants