The major instrument on Mt. Hopkins is the MMT Observatory's 6.5-m-diameter optical telescope. The full suite of FLWO telescopes also includes a 1.3-m-diameter infrared telescope; a 1.2-m-diameter imaging optical/infrared telescope; the HAT (Hungarian Automated Telescope) network of optical refractor telescopes, the MEarth array of eight 40-cm optical reflector telescopes, the 1.5-m Tillinghast spectroscopic telescope, and VERITAS, a major ground-based gamma-ray observatory.
The Las Campanas Observatory on Cerro Las Campanas in Chile, operates twin 6.5-m optical telescopes for a consortium of institutions, which includes Harvard University, the Carnegie Observatories, MIT, the University of Michigan, and the University of Arizona. Separated by 60 m, the twin telescopes afford fine "natural seeing," from an elevation of 2400 m (8000 feet) in the Chilean Andes and unparalleled access to the Southern Hemisphere skies for astronomers.
The MMT Observatory, a 6.5-meter-diameter optical telescope, is located on the summit of Mt. Hopkins at the Fred Lawrence Whipple Observatory, 30 miles south of Tucson, Arizona. The telescope (operated jointly by SAO and the University of Arizona) includes a suite of advanced wide-field imagers and spectrographs developed and deployed for the MMT by SAO scientists.
VERITAS (Very Energetic Radiation Imaging Telescope Array System) is a major ground-based gamma-ray observatory with an array of four 12m optical reflectors for gamma-ray astronomy in the GeV - TeV energy range. Located at FLWO in Arizona, it consists of an array of imaging telescopes that permit the maximum versatility and give the highest sensitivity in the detection of light created by cosmic gamma rays striking the earth's atmosphere.