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Mount Graham International Observatory

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Location  Mount Graham, Arizona
Altitude  3191 m (10,467 feet)
Phone  +1 928-428-2739
Coordinates  MGIO USA, Arizona
Heinrich Hertz Submillimeter Telescope  10m radio dish
Organization  Steward Observatory
Mount Graham International Observatory
Large Binocular Telescope  optical binocular- two 8.4m mirrors
Address  1480 AZ-366, Safford, AZ 85546, USA
Similar  Mount Graham, Pinaleno Mountains, Roper Lake State Park, Thirty Meter Telescope, Kitt Peak National Observatory

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Mount Graham International Observatory (MGIO) is a division of Steward Observatory, the research arm for the Department of Astronomy at The University of Arizona, in the United States. It is located in southeastern Arizona's PinaleƱo Mountains near Mount Graham. Scientific researchers from around the world make use of the MGIO facilities.


Construction of MGIO began in 1989. MGIO currently operates and maintains facilities for three scientific organizations. The first two telescopes, the Vatican Advanced Technology Telescope and the Heinrich Hertz Submillimeter Telescope began operations in 1993. The Large Binocular Telescope, one of the world's largest and most powerful optical telescopes, began operations using mirrors independently in 2004, with joint operations between the two mirrors beginning in 2008.

Public tours of the MGIO are conducted by the Eastern Arizona College's (EAC) Discovery Park Campus. Weather permitting, tours are allowed between mid-April and mid-October. Reservations and permits must be obtained at least one week in advance through EAC's Discovery Park Campus. For information about the tours, call +1-928-428-6260, or search for the Discovery Park Campus contact info on the Eastern Arizona College webpage.

List of facilities

  • Large Binocular Telescope operated by the Large Binocular Telescope Corporation.
  • Heinrich Hertz Submillimeter Telescope, operated by Arizona Radio Observatory.
  • Vatican Advanced Technology Telescope, operated by the Vatican Observatory.
  • References

    Mount Graham International Observatory Wikipedia