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W. M. Keck Observatory
The summit of Mauna Kea is considered one of the most important astronomical viewing sites in the world. The twin Keck telescopes are two of the largest optical/near-infrared instruments.
Organization:	California Association for Research in Astronomy
Location:	Mauna Kea, Hawai'i, USA
Wavelength:	Optical, near infrared
Built:	Keck I 1993, Keck II 1996
Telescope style:	Reflector
Diameter:	10m each
Angular resolution:	0.04 to 0.4 arcseconds for individual telescopes, depending on target and instruments used
Focal length:	17.5 m (f/1.75)
Mounting:	Alt/az
Dome:	Spherical
Website:	http://www.keckobservatory.org/

The W. M. Keck Observatory is a two-telescope astronomical observatory at the 4,145 meter (13,600 ft) summit of Mauna Kea in Hawai'i. The primary mirror of each of the two telescopes are 10 meter (400 inch) in diameter, currently the world's largest telescopes for optical and near-infrared astronomy (Until completion of the Spanish Gran Telescopio in the Canaries). The telescopes can also operate together to form a single astronomical interferometer. In 1985, Howard B. Keck of the W. M. Keck Foundation gave $70 million to fund the design and construction of the Keck I Telescope. The key advance that allowed the construction of the Keck's large telescopes was the ability to operate smaller mirror segments as a single large mirror. In the case of the Keck each of the primary mirrors is composed of 36 hexagonal segments that work together as a single piece of reflective glass. On the telescope, each segment's is kept stable by a system of extremely rigid support structures and adjustable warping harnesses. During observing, a computer-controlled system of sensors and actuators adjusts the position of each segment, relative to its neighbors, to an accuracy of four nanometers. This twice-per-second adjustment counters varying distortions due to gravity. Both Keck telescopes are equipped with adaptive optics, which compensates for the blurring due to atmospheric turbulence.

Each Keck telescope sits on an altazimuth mount. Extensive computer analysis determined that this mounting style provides the greatest strength and stiffness for the least amount of steel, about 270 tons per telescope. The total weight of each telescope is about 300 tons.

In addition, the Keck I and Keck II telescopes can work together as the Keck Interferometer. The 85 m separation between the two telescopes gives them the effective angular resolution in one direction of an 85 m mirror. Along this axis, the Keck Interferometer have a spatial resolution of 5 milliarcseconds (mas) at 2.2 micrometres (µm), and 24 mas at 10 µm. In its most sensitive configuration, the interferometer would reach K=21 and N=10 mag in 1000 seconds of integration (SNR = 10 per baseline). The interferometer has several back-end instruments, allowing for a variety of observation types. The lack of additional outrigger telescopes makes the Keck Interferometer unsuitable for interferometric imaging, so work has concentrated on nulling interferometry and angular diameter measurements instead. In September 2005 the Keck Interferometer demonstrated nulling interferometry for the first time, with a modest null depth of 100 times.

The Keck Observatory is managed by the California Association for Research in Astronomy, a non-profit 501 (c)(3) organization whose board of directors includes representatives from Caltech and the University of California. Construction of the telescopes was made possible through private grants totaling more than $140 million provided by the W. M. Keck Foundation. The National Aeronautics and Space Administration (NASA) joined the partnership in October, 1996. The Keck I telescope began observations in May 1993, Keck II in October 1996. Telescope time is allocated by the partner institutions. Caltech, the University of Hawai'i System, and the University of California accept proposals from their own researchers. NASA accepts proposals from researchers based in the U.S., while NOAO accept proposals from researchers around the world [1].

• List of largest optical reflecting telescopes

• W.M. Keck Observatory (official site)
• The Mauna Kea Observatory (official site)
• W.M. Keck Telescope facts
• Indigenous Controversy
• Keck Telescopes on Wikimapia (only one visible)
• Photos of Keck telescopes and other Mauna Kea observatories from "A Gentle Rain of Starlight: The Story of Astronomy on Mauna Kea" by Michael J. West. ISBN 0-93154-899-3.

Coordinates: 19°49′35″N, 155°28′27″W

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