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USA 274

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USA 274 is classified as:


NORAD ID: 42058
Int'l Code: 2017-011A
Perigee: 1,106.6 km
Apogee: 1,120.1 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   21023.14139442 0.00000000  00000-0  00000-0 0    08
2 42058  63.4449 129.1406 0008985  78.6597 281.3403 13.40821188    03
Source of the keplerian elements: McCants