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Leonhard Euler Telescope, or the Swiss EULER Telescope, is a national, fully automatic reflecting telescope, built and operated by the Geneva Observatory. It is located at an altitude of at ESO's La Silla Observatory site in the Chilean Norte Chico region, about 460 kilometers north of the capital, Santiago de Chile. The telescope saw its first light on 12 April 1998 and is named after the Swiss mathematician Leonhard Paul Euler (1707–1783).〔(【引用サイトリンク】title=Swiss 1.2-metre Leonhard Euler Telescope )〕〔(【引用サイトリンク】title=EULER )〕 ''Euler'' uses the CORALIE instrument to search for exoplanets. In addition, the telescope uses the multi-purpose EulerCam (ecam), a high precision photometry instrument, and a smaller, piggyback mounted telescope, called "Pisco".〔 Its first discovery was a planet in orbit around Gliese 86, determined to be a hot Jupiter with an orbital period of only 15.8 earth days and about four times the mass of Jupiter.〔 Since then, many other exoplanets have been discovered or examined in follow-up observations. Together with the Mercator Telescope, ''Euler'' was part of the ''Southern Sky extrasolar Planet search Programme'' which has discovered numerous extrasolar planets.〔 It has also been frequently employed for follow-up characterization to determine the mass of exoplanets discovered by the ''Wide Angle Search for Planets'', SuperWASP.〔http://adsabs.harvard.edu/abs/2010A%26A...517L...1Q〕 == Instruments == The ''CORALIE spectrograph'' is an echelle type spectrograph used for astronomy and was commissioned at the Euler Telescope in April 1998. The instrument performs doppler spectroscopy, that is it measures the Doppler effect on a star's electromagnetic spectrum caused by the gravitational tug of an exoplanet orbiting around it.〔ESO publication, D. Queloz and M. Mayor, (From CORALIE to HARPS ), September 2001〕 The spectrograph participates in the (Southern Sky extrasolar Planet search Programme ). Doppler spectroscopy, also known as "radial velocity" or "wobble" method, is an indirect detection method as it only observes the star's spectrum and not the planet itself. It differs from the transit method used by the space-based Kepler mission and ground-based SuperWASP and Next-Generation Transit Survey and can therefore be complementary to their observations. This is because the size of an exoplanet can be estimated using the transit method, while Doppler spectroscopy is used to estimate its mass. By combining the measured size and mass from both methods, it can be determined whether the observed exoplanet is gaseous or rocky. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Leonhard Euler Telescope」の詳細全文を読む スポンサード リンク
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