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Kepler-186f
Kepler-186f is an exoplanet orbiting the red dwarf Kepler-186, about from the Earth.〔
It is the first planet with a radius similar to Earth's to be discovered in the habitable zone of another star. NASA's Kepler spacecraft detected it using the transit method, along with four additional planets orbiting much closer to the star (all modestly larger than Earth).〔 Analysis of three years of data was required to find its signal. The results were presented initially at a conference on 19 March 2014〔 See session 19 March 2014 – Wednesday 11:50–12:10 – Thomas Barclay: The first Earth-sized habitable zone exoplanets.〕 and some details were reported in the media at the time. The full public announcement was on 17 April 2014,〔 followed by publication in ''Science''.〔
== Orbital parameters relative to habitable zone ==
Kepler-186f orbits an M-dwarf star with about 4% of the Sun's luminosity with an orbital period of 129.9 days and an orbital radius of about 0.36〔 or 0.40〔 times that of Earth's (compared to 0.39 AU for Mercury). The habitable zone for this system is estimated conservatively to extend over distances receiving from 88% to 25% of Earth's illumination (from 0.22 to 0.40 AU).〔 Kepler-186f receives about 32%, placing it within the conservative zone but near the outer edge, similar to the position of Mars in our Solar System.〔
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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