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Kepler-42
Kepler-42, formerly known as KOI-961, is a red dwarf located in the constellation Cygnus and approximately 126 light years from the Sun. It has three known extrasolar planets, all of which are smaller than Earth in radius,〔 and likely also in mass.
==Characteristics==
Kepler-42's mass is estimated to be 0.13 times that of the Sun, and to have a radius 0.17 times that of the Sun, that is, just 1.7 times that of the gas giant Jupiter. Due to its small radius and hence surface area, the luminosity of Kepler-42 is only 0.24% of that of the Sun. Its metallicity is one third of the Sun. Kepler-42 has an appreciable proper motion of up to 431±8 mas/yr.〔 Due to its small size and low temperature, the star's habitable zone is much closer to the star than Earth is to the Sun.
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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