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Gliese 221
Gliese 221 is an orange-red dwarf star. ==Planetary system== From 2003 to 2012, the star was under observance from HARPS. It is becoming less active and this reduced activity allowed for lower-mass planetary measurements to be made. In 2012, a super-Venus planet, and an eccentric Neptune / Saturn in the habitable zone,〔The preprint defined the star's HZ to 0.5-0.9 AU. Square root of luminosity would put an Earth analogue at 0.31 AU. The planet's semimajor is 0.435 AU.〕 were deduced by radial velocity. They were published in January 2013. In January 2014, a new, sub-Saturn planet candidate was reported.〔(A new cold sub-Saturnian candidate planet orbiting GJ 221 ): Mikko Tuomi, January 16, 2014〕
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Gliese 221」の詳細全文を読む
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