Mauna Kea Observatories

The world’s largest observatory for optical, infrared and submillimeter astronomy is positioned at the 4,200 meter (13,796-foot ) summit of Mount Mauna Kea in Hawaii. Mauna Kea is managed by the University of Hawaii Institute for Astronomy.

The Mauna Kea Observatories began from a single telescope placed at the summit on the advice of Gerard Kuiper in 1965 following the dedication of the Mauna Haleakala Observatory.

Mauna Kea’s environment has a number of advantages. The vast expanse of surrounding ocean provides a thermally stable environment lacking mountain ranges that disturb the upper atmosphere or throw light-reflecting dust into the air. The dearth of city lights means that there is usually neglible light pollution and the atmosphere over Mauna Kea is normally calm, clear and dry.

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Telescopes

Mauna Kea has thirteen working telescopes: nine optical and infrared, three submillimeter wavelength and one radio.

Optical and infrared

W. M. Keck Observatory

The Keck Observatory consists of twin, 10 meter, optical infrared telescopes, both standing eight stories high and weighing 300 tons. The twin telescopes utilise primary mirrors, ten meters in diameter composed of 36 hexagonal segments to form a single piece of reflective glass.

Keck I began operations in May of 1993 and Keck II in October of 1996. Keck observatory was funded by a grant from the W. M. Keck Foundation and is operated by the California Association for Research in Astronomy (CARA) under the direction of the California Institute of Technology, the University of California and the National Aeronautics and Space Administration (NASA).

Each of the twin telescopes uses an altitude-azimuth design to provide optimal mass and strength balance: The stiff construction resists structural twisting and warping from gravitational forces, making it possible to accurately track objects moving across the sky.

The dome of the observatory is insulated and chilled to or below freezing to control temperature variation that would otherwise deform the telescopes’ steel and mirrors. Astronomers gather data remotely from facilities in Waimea as assistants operate the telescope.

Turbulent atmospheric conditions which normally distort astronomical observations are corrected by adaptive optics (AO) which employ a deformable mirror 6 inches in diameter that can change shape 670 times per second to cancel out atmospheric distortion and increase sharpness by a factor of 10.