Welcome to Mount Graham International Observatory!

MGIO is a division of Steward Observatory, the research arm for the Department of Astronomy at the University of Arizona.  Scientific researchers from around the world make use of MGIO facilities. We serve this community, operating and maintaining facilities at the remote observing site located in the Pinaleño Mountains in southeast Arizona. This area is part of the Coronado National Forest -- administered by the Safford Ranger District, U.S. Forest Service. Our office, the MGIO Base Camp, is located at the eastern base of Mount Graham, six miles south of Safford, Arizona.

Research telescopes at MGIO are:

Vatican Advanced Technology Telescope

Heinrich Hertz Submillimeter Telescope

The Large Binocular Telescope

2024 UPDATE: MGIO has converted to a new phone system, moving forward our main phone line number will be 520-621-8650. The local phone number is no longer active. 

Please visit the University of Arizona Human Resources website for any information on open job positions for a unique and exciting opportunity!