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UFO 11



UFO 11, also known as USA 174, is an American geostationary military communications satellite that was launched by an Atlas 3 rocket from Cape Canaveral at 02:30 UT on 18 December 2003. ("UFO" has been identified as the acronym for Uhf Follow-On.) The 1.4 tonne satellite is the eleventh and final of the UFO constellation which provide secure communications in UHF band and frequencies among ships, aircraft, mobile ground terminals even during severe weather conditions. It will be parked at 172 deg E longitude.

Alternate Names

  • 28117
  • UFO11
  • USA 174

Facts in Brief

Launch Date: 2003-12-18
Launch Vehicle: Atlas 3
Launch Site: Cape Canaveral, United States

Funding Agency

  • Unknown (United States)


  • Communications
  • 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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