Main Page | See live article | Alphabetical index The W.M. Keck telescopes are the two largest telescopes of the Mauna Kea Observatory on Mauna Kea in Hawai'i. These are reflecting telescopes located at an altitude of 4,145 m (13,600 ft). Keck I started observing in 1993 and Keck II started in 1996. This is a Ritchey-Chrétien type of telescope on an altazimuth mount, assisted by active optics. The Keck telescopes have, essentially, 10m mirrors; however, rather than having one mirror each telescope has 36 smaller hexagonal mirrors working together. In addition, Keck I and II can work together, via interferometry; this gives them the effective power of an 85m mirror. The telescopes are owned by the University of California and Caltech. External Links The Mauna Kea Observatory (official site) W.M. Keck Observatory (official site) W.M. Keck Telescope facts This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.