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HD 205739 b is an extrasolar planet located approximately 350 light-years away〔 in the constellation of Piscis Austrinus, orbiting the star HD 205739. This planet has a minimum mass 37% more than Jupiter and orbits 90% of the distance between the Earth and the Sun. The planet has a very elliptical orbit, which has led its discoverers to postulate that the planet's surface temperature varies by about 100 K along the entire orbit.〔 This planet was reported on September 5, 2008 after its discovery at Las Campanas Observatory, where the planet was observed for years by the N2K Consortium while using the Magellan Telescopes. Follow-up observations collected the radial velocity measurements necessary to confirm the candidate as a planet.〔 ==Discovery== HD 205739's designation is from the Henry Draper catalogue. The star was also observed by ''Hipparcos'', which released its catalogue in 1997. The observations that led to the discovery of the planet HD 205739 b started when the N2K Consortium started an extended search for planets around 300 stars not usually targeted by Doppler spectroscopy surveys. In the case of HD 205739, the star was observed using the Magellan Telescopes at Las Campanas Observatory in Chile. HD 205739 was selected primarily because it was a metal-rich star; the N2K collaboration biased their search towards metal-rich stars with closely orbiting Jupiter-size planets, hoping to find a connection between a star's metallicity and its planets' masses.〔 HD 205739 was flagged originally as a candidate hosting a Hot Jupiter, which is a large gas giant that orbits closely to its star, although later observations suggested that the planetary candidate orbited further out over the next 3.5 years of observation.〔 The star was studied through the Magellan Inamori Kyocera Echelle spectrograph's (MIKE) ability to use Doppler spectroscopy to measure radial velocity. Twenty-four measurements were recorded for HD 205739. The measurements were analyzed for accuracy. They were then used to derive the planet's characteristics, which led to the planet's confirmation.〔 The team of astronomers, which were from the United States, Chile, and the Vatican City, sent the paper to the ''Astronomical Journal'' on April 7, 2008. The paper was accepted, and was later published on October 7, 2008.〔 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「HD 205739 b」の詳細全文を読む スポンサード リンク
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