Hobby-Eberly Telescope (HET)
The Hobby-Eberly Telescope (HET) is an 11-meter reflector at an altitude of 1,980 meters on Mount Fowlkes, Texas, opened in 1997, and designed mainly for spectroscopy rather than imaging. Its mirror is made from 91 hexagonal segments each 1 meter across. Permanently angled at 55°, the telescope is free to move in azimuth. The HET, named after two benefactors, is part of the McDonald Observatory, and is jointly owned by the University of Texas, Pennsylvania State University, Stanford University, the Ludwig Maximilian University in Munich, and the Georg-August University in Göttingen. Among its uses are radial velocity measurements of nearby stars in the search for extrasolar planets.