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HD 7924 b
HD 7924 b is an extrasolar planet located approximately 54 light years away in the constellation of Cassiopeia, orbiting the 7th magnitude K-type main sequence (slightly metal poor) star HD 7924.〔 It was published on January 28, 2009 and is the second planet discovered in the constellation Cassiopeia. (The first planet discovered in this constellation is HD 17156 b, which was published on April 14, 2007).
==Super-Earth==
HD 7924 b is a super-Earth exoplanet with a minimum mass 9.2 times that of Earth and takes only about 129.5 hours to orbit the star, at an average distance of . When HD 7924 b was discovered in 2009, it was one of only eight planets known with a minimum mass less than 10 Earths.〔 Also a super-Earth discovery makes 2009 the fifth year in a row since 2005 to have super-Earth planets discovered.
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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