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KOI-2626.01
KOI-2626.01 is a candidate Near-Earth sized exoplanet orbiting around the Red dwarf star KOI-2626 in its Habitable zone every 38.1 days some 623 ly away from the Earth.〔http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=KOI-2626.01〕 Its is the first potentially habitable exoplanet that is part of a quadruple star system.〔http://nexsci.caltech.edu/conferences/KeplerII/abstracts_posters/Ciardi.pdf〕
==Physical Characteristics==
When its first transit was witnessed by Kepler the planet was initially presumed to have a radius of 1.4 R⊕. Additional transits by Kepler with increased precision trimmed down to the radius to 1.3R⊕ and then 1.1R⊕. PHL has cataloged the planet as having a radius of 1.1R⊕ but new data from the K2 project suggests a radius of 0.97R⊕ is more probable however it's likely that the data will continue to change with additional transits. Other properties of the exoplanet are relatively unknown. Mass estimations from PHL are based on older and outdated data presuming that the planet has a radius of 1.1R⊕ it is estimated that if the exoplanet is mostly iron it would have a mass of approximately 4.0M⊕. If the exoplanet is rocky and has a similar density to Earth it would likely have a mass of 1.3M⊕ and if it was a water world it would have a mass of 0.6M⊕.〔http://phl.upr.edu/projects/habitable-exoplanets-catalog/data〕〔http://exoplanetarchive.ipac.caltech.edu/cgi-bin/DisplayOverview/nph-DisplayOverview?objname=KOI-2626.01〕
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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