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USA 161



USA 161 is an American military visual/radar imaging satellite that was launched by a Titan 4B rocket from Vandenberg AFB at 21:21 UT on 5 October 2001. The 13 tonne (with fuel) satellite belongs to the National Reconnaissance Office (NRO) within its fleet of Earth Imaging System (EIS) satellites. A BBC website reported a resolution of 10 cm in the images. (The commonly used name for the EIS satellites is Advanced Keyholes.) The first member of the EIS fleet is USA 144 (1999-028A), launched in May 1999.

Alternate Names

  • 26934
  • USA161

Facts in Brief

Launch Date: 2001-10-05
Launch Vehicle: Titan 4B
Launch Site: Vandenberg AFB, United States

Funding Agency

  • Unknown (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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