A division of Steward Observatory founded in 2002 which owns and operates a 12-m millimetre-wave dish on Kitt Peak, Arizona, and the 10-m Submillimeter Telescope (SMT) on Mount Graham, Arizona. The 12-m dish is a former prototype antenna for the Atacama Large Millimeter/submillimeter Array. Ownership was transferred to ARO in 2013, when it was moved from the Very Large Array site in New Mexico. It reopened at ARO in 2014. The SMT, formerly known as the Heinrich Hertz Telescope, was opened in 1994 and transferred to ARO in 2002.
http://aro.as.arizona.edu/ Official observatory website.