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Words near each other
・ Gliese 1214
・ Gliese 1214 b
・ Gliese 146
・ Gliese 15 Ab
・ Gliese 163
・ Gliese 163 c
・ Gliese 167
・ Gliese 176
・ Gliese 176 b
・ Gliese 179
・ Gliese 179 b
・ Gliese 180
・ Gliese 205
・ Gliese 208
・ Gliese 22
Gliese 221
・ Gliese 229
・ Gliese 229 Ab
・ Gliese 229 B
・ Gliese 251
・ Gliese 268
・ Gliese 282
・ Gliese 299
・ Gliese 3021 b
・ Gliese 317
・ Gliese 317 b
・ Gliese 318
・ Gliese 3470 b
・ Gliese 3634
・ Gliese 3634 b


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Gliese 221 : ウィキペディア英語版
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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