W. M. Keck Observatory

W. M. Keck Observatory

The Keck observatory domes atop Mauna Kea
Alternative names	Keck telescope
Part of	Mauna Kea Observatories
Location(s)	Hawaii
Coordinates	19°49′35″N 155°28′28″W / 19.8263°N 155.47441°W / 19.8263; -155.47441
Altitude	4,145 m (13,599 ft)
First light	November 24, 1990 (1990-11-24), October 23, 1996 (1996-10-23)
Telescope style	astronomical observatory reflecting telescope
Number of telescopes	2
Diameter	10 m (32 ft 10 in)
Angular resolution	0.04 arcsecond, 0.4 arcsecond
Collecting area	76 m2 (820 sq ft)
Focal length	17.5 m (57 ft 5 in)
Enclosure	spherical dome
Website	keckobservatory.org
Location of W. M. Keck Observatory
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[edit on Wikidata]

The W. M. Keck Observatory is an astronomical observatory with two telescopes at an elevation of 4,145 meters (13,600 ft) near the summit of Mauna Kea in the U.S. state of Hawaii. Both telescopes have 10 m (33 ft) aperture primary mirrors, and, when completed in 1993 (Keck I) and 1996 (Keck II), they were the largest optical reflecting telescopes in the world. They are currently the third and fourth largest.