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USA 274

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USA 274 is classified as:


NORAD ID: 42058
Int'l Code: 2017-011A
Perigee: 1,107.7 km
Apogee: 1,119.1 km
Inclination: 63.4 °
Period: 107.4 minutes
Semi major axis: 7484 km
RCS: Unknown
Launch date: March 1, 2017
Source: United States (US)
Launch site: AIR FORCE WESTERN TEST RANGE (AFWTR)

USA 274 is a military satellite that carries equipment to track ships and aircraft via their radio transmissions. Positions of the origin of the transmissions are determined by triangulation. Each launch consists of two satellites of similar size in the same orbit. Both satellites maneuver to stationkeep relative to one another.
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NASA's NSSDC Master Catalog

Two Line Element Set (TLE):
1 42058U 17011A   21097.72278856 0.00000000  00000-0  00000-0 0    06
2 42058  63.4408 299.3805 0007627  56.9464 303.0536 13.40818655    09
Source of the keplerian elements: McCants