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Gemini telescope : ウィキペディア英語版
Gemini Observatory

The Gemini Observatory is an astronomical observatory consisting of two telescopes, the Gemini North and Gemini South at different sites in Hawaii and Chile, respectively. Together, the twin Gemini telescopes provide almost complete coverage of both the northern and southern skies. They are currently among the largest and most advanced optical/infrared telescopes available to astronomers ''(see List of largest optical reflecting telescopes)''.
The Gemini telescopes were built and are operated by a consortium consisting of the United States, Canada, Chile, Brazil, Argentina, and Australia. This partnership is managed by the Association of Universities for Research in Astronomy (AURA). The United Kingdom dropped out of the partnership at the end of 2012 and the Gemini Observatory has responded to this by significantly reducing its operating costs, so that no new partners are required beginning in 2013.
== Overview ==

The Gemini Observatory's international Headquarters and Northern Operations Center is located in Hilo, Hawaii at the University of Hawaii at Hilo University Park. The Southern Operations Center is located on the Cerro Tololo Inter-American Observatory (CTIO) campus near La Serena, Chile.
* The "Gemini North" telescope, officially called the ''Frederick C. Gillett Gemini Telescope'' is located on Hawaii's Mauna Kea, along with many other telescopes. That location provides excellent viewing conditions due to the superb atmospheric conditions (stable, dry, and rarely cloudy) above the dormant volcano. It saw first light in 1999 and began scientific operations in 2000.
* The "Gemini South" telescope is located at over elevation on a mountain in the Chilean Andes called Cerro Pachón. Very dry air and negligible cloud cover make this another prime telescope location (again shared by several other observatories, including the SOAR Telescope and Cerro Tololo Inter-American Observatory). Gemini South saw first light in 2000.
Together, the two telescopes cover almost all of the sky except for two small regions near the celestial poles: Gemini North cannot point north of declination +89 degrees, and Gemini South cannot point south of declination −89 degrees.
Both Gemini telescopes employ a range of advanced technologies to deliver the highest quality images, including laser guide stars, adaptive optics, multi conjugate adaptive optics, and multi-object spectroscopy. In addition, the two telescopes allow very high-quality infrared observations due to the advanced protected silver coating of their mirrors, their small secondary mirrors (due to the f16 focal ratio), and advanced ventilation systems. Thanks to a high degree of networking, the Gemini telescopes can be operated remotely, and observations can be run when atmospheric conditions suit them best, reducing unnecessary travel by astronomers.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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