Hobby-Eberly Telescope

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Hobby–Eberly Telescope

(hob -ee eb -er-lee) (HET) A telescope at the McDonald Observatory in Texas, used mainly for spectrographic surveys. It has an 11-meter segmented spherical mirror (f/1.3, with an effective aperture of 9.2 meters) on an altazimuth mounting, tipped at a permanent angle of 35° to the zenith. A movable secondary mirror reflects images onto it, and in this way it can survey 70% of the sky visible at the site. It was commissioned in 1997.