Mount Graham International Observatory

Mount Graham International Observatory

The Large Binocular Telescope is the largest telescope of Mount Graham International Observatory.
Organization	Steward Observatory
Location	Mount Graham, Arizona
Coordinates	32°42′04.69″N 109°53′31.25″W / 32.7013028°N 109.8920139°W / 32.7013028; -109.8920139 MGIO USA, Arizona
Altitude	3191 m (10,467 feet)
Website	http://mgio.arizona.edu/
Telescopes
Large Binocular Telescope optical binocular- two 8.4m mirrors Heinrich Hertz Submillimeter Telescope 10m radio dish Vatican Advanced Technology Telescope 1.8m primary on an alt-az mount
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32°42′04.69″N 109°53′31.25″W / 32.7013028°N 109.8920139°W / 32.7013028; -109.8920139

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 Pinaleño 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.