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HD 219134 b
HD 219134 b (or HR 8832 b) is one of four exoplanets orbiting HR 8832, a main-sequence star in the constellation of Cassiopeia.〔〔〔〔(PLANET HOST OVERVIEW PAGE )〕 As of July 2015, super-Earth HD 219134 b, with a size of about 1.6 Earth Radii, and a density of 6g/cm3, was reported as the closest rocky exoplanet to the Earth, at 21.25 light-years away.〔 The exoplanet was initially detected by the instrument HARPS-N of the Italian Telescopio Nazionale Galileo via the radial velocity method and subsequently observed by the Spitzer telescope as transiting in front of its star.〔〔 The exoplanet has a mass of about 4.5 times that of Earth and orbits its host star every three days.〔
==See also==
* List of exoplanet extremes
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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