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USA 274



This satellite 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.

Alternate Names

  • 42058
  • NOSS 3
  • Naval Ocean Surveillance System
  • USA274

Facts in Brief

Launch Date: 2017-03-01
Launch Vehicle: Atlas V 401
Launch Site: Vandenberg AFB, United States

Funding Agency

  • United States Naval Academy (United States)


  • Surveillance and Other Military

Additional Information

Questions and comments about this spacecraft can be directed to: Coordinated Request and User Support Office

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