The W.M. Keck telescopes
are the two largest telescopes
of the Mauna Kea Observatory
on Mauna Kea
. 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.