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Kepler-186
Kepler-186 is a main-sequence M1-type dwarf star, located 151 (unicode:±) 18 parsecs (492 (unicode:±) 59 light years) away in the constellation of Cygnus. The star is slightly cooler than the sun, with roughly half its metallicity. It is known to have five planets, including the first Earth-sized world discovered in the habitable zone: Kepler-186f.〔 free version = http://www.nasa.gov/sites/default/files/files/kepler186_main_final.pdf〕 The star hosts four other planets discovered so far, though Kepler-186 b, c, d, and e are too close to the star, and so too hot, to have liquid water.
==Star==
A number of previously unknown measurements of the star are known.〔(VizieR Detailed Page ) for 2MASS 19543665+4357180, "This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation."〕〔(VizieR Detailed Page ), KIC 8120608, Kepler Input Catalog (Kepler Mission Team, 2009)〕 In the infrared/microwave EM spectrum〔 its H band magnitude is 11.605, J band magnitude is 12.473, and its K band magnitude is 11.605. In the visual Photometric system magnitude it is 14.90(R)(towards the red end of the visual spectrum) and 16.40(B)(the blue end of the spectrum)〔 (see also Apparent magnitude.) It is a BY Draconis variable changing brightness slightly, probably from starspots, with a period of 33.695 days.
The star is a Red dwarf/M-class bordering on being an Orange dwarf/K-class star, with a mass nearly half that of the Sun's, with a density ~1.59 x 105 kg/m3.
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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