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41 Lyncis (also called HD 81688) is the Flamsteed designation〔 for a fifth magnitude star located in the northern constellation of Ursa Major. Typically, 'Lyncis' is the genitive for a star found in the constellation Lynx. However, when the constellation boundaries were officially established by the International Astronomical Union in 1930, this star was located within Ursa Major. The distance to this star can be determined using parallax measurements, yielding an estimate of roughly away.〔 Although flagged as a double star by SIMBAD,〔 it appears to be a single star.〔 A planetary companion was announced in 2008.〔 The spectrum of this star matches a stellar classification of K0 III-IV,〔 with the luminosity class of III-IV suggesting it is at an evolutionary stage part way between a subgiant star and a giant star. This star has about double the mass of the Sun, although Kunitomo et al. (2011) give a lower estimate of solar masses.〔 It has expanded to 11 times the Sun's radius and is radiating 55 times as much luminosity as the Sun from its outer atmosphere at an effective temperature of 4,789 K.〔 This heat gives it the orange-hued glow of a K-type star.〔 This star is following an orbit through the Milky Way with an eccentricity of 0.21. This will take it as close to the Galactic Center as and as far as . The inclination of this orbit will carry it as much as away from the galactic plane. For this reason, it is uncertain whether this star is a member of the thin disk population.〔 == Planet == On 19 February 2008 a planet was announced orbiting this star. Designated 41 Lyncis b, it has 2.7 times the mass of Jupiter and completes an orbit every 184 days.〔 The planet and its host star is one of the planetary systems selected by the International Astronomical Union as part of their public process for giving proper names to exoplanets and their host star (where no proper name already exists).〔(NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars ). IAU.org. 9 July 2014〕〔(NameExoWorlds ).〕 The process involves public nomination and voting for the new names, and the IAU plans to announce the new names in mid-November 2015.〔(NameExoWorlds ).〕 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「41 Lyncis」の詳細全文を読む スポンサード リンク
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