Fred Lawrence Whipple Observatory
The Fred Lawrence Whipple Observatory, formerly known as Mount Hopkins Observatory, is located on Mount Hopkins, Arizona, at an altitude of 2,600 m and operated by the Smithsonian Institution. Its main instrument is the Multiple Mirror Telescope (MMT). The Observatory also operates a number of smaller instruments including a 1.2-m diameter imaging optical telescope; the 1.5-m Tillinghast optical spectroscopic telescope; the HAT (Hungarian-made Automated Telescope) array of five optical telescopes, and the MINERVA array of four 70-cm optical telescopes.
Multiple Mirror Telescope
The Multiple Mirror Telescope (MMT) is a 6.5-m telescope located at an altitude of 2,606 m (8,550 ft) on the summit of Mount Hopkins, the second highest peak in the Santa Rita Range of the Coronado National Forest, about 55 km south of Tucson, Arizona, on the grounds of the Fred Lawrence Whipple Observatory. In 1998, the large single mirror replaced six identical 1.8-m mirrors on a common mount (with a combined light-collecting power of a 4.5-m mirror), which had been in use since 1979. Just before it was upgraded, the old MMT was used in a pioneering demonstration of nulling interferometry to image the dust cloud around Betelgeuse. The MMT is a joint venture of the University of Arizona, which operates the MMT, and the Smithsonian Institution.