Subaru (telescope)
The Subaru Telescope
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| Organisation |
National Astronomical Observatory of Japan 
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| Location(s) |
Mauna Kea , United States of America
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| Coordinates | 19°49′32″N 155°28′36″W / 19.825555555556°N 155.47666666667°WCoordinates: 19°49′32″N 155°28′36″W / 19.825555555556°N 155.47666666667°W |
| Altitude | 4,139 m (13,579 ft) |
| Wavelength | Optical/Infrared |
| Built | Completed 1998 |
| Telescope style |
optical telescope
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| Diameter | 8.3 m (8.2 m usable) |
| Secondary diameter | 1330/1400/1265 mm |
| Angular resolution | 0.23″ |
| Collecting area | 53 m2 (570 sq ft) |
| Focal length | f/1.83 (15.000 m) |
| Mounting | Altitude/Azimuth |
| Enclosure | 
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| Website | www |
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Subaru Telescope (すばる望遠鏡 Subaru Bōenkyō?) is the 8.2-metre flagship telescope of the National Astronomical Observatory of Japan, located at the Mauna Kea Observatory on Hawaii. It is named after the open star cluster known in English as the Pleiades. It had the largest monolithic primary mirror in the world from its commission until 2005.
Subaru is a Ritchey-Chretien reflecting telescope. Instruments can be mounted at a Cassegrain focus below the primary mirror, in enclosures on either of two Nasmyth focal points on the sides of the telescope mount, to which light can be directed with a tertiary mirror, or, in an arrangement rare on large telescopes, at the prime focus, in lieu of a secondary mirror, to provide a wide field of view suited to deep wide-field surveys.
In 1984, the University of Tokyo formed an engineering working group to study the concept of a 7.5-metre telescope. In 1985, the astronomy committee of Japan's science council gave top priority to the development of a "Japan National Large Telescope" (JNLT), and in 1986, the University of Tokyo signed an agreement with the University of Hawaii to build the telescope in Hawaii. In 1988, the National Astronomical Observatory of Japan was formed through a reorganization of the University's Tokyo Astronomical Observatory, to oversee the JNLT and other large national astronomy projects.
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