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Gliese 667 Cc (also known as GJ 667Cc, HR 6426Cc, or HD 156384Cc)〔(【引用サイトリンク】 title=HD 156384Cc -- Extra-solar Confirmed Planet )〕 is an exoplanet 23.62 light years away. It orbits around Gliese 667 C, which is a member of the Gliese 667 triple star system, in the constellation of Scorpius. Gliese 667 Cc was first announced in a pre-print made public on 21 November 2011 by the European Southern Observatory's High Accuracy Radial Velocity Planet Searcher (HARPS) group using the radial velocity method (Doppler method).〔European Southern Observatory. ''Press information: The HARPS search for southern extra-solar planets.'' 11.24.2011. ()〕 However, the announcement of a refereed journal report came on 2 February 2012 by researchers at the University of Göttingen and the Carnegie Institution for Science.〔University of Göttingen. ''Presseinformation: Wissenschaftler entdecken möglicherweise bewohnbare Super-Erde - Göttinger Astrophysiker untersucht Planeten in 22 Lichtjahren Entfernung.'' Nr. 17/2012 - 02.02.2012. (Announcement on university homepage, retrieved 2012-02-02 )〕 Gliese 667Cc has a semi-major axis of only 0.1251 astronomical units, making its year only 28.155 days long. Based on GJ 667 C's bolometric luminosity, GJ 667 Cc would receive 90% of the light Earth does; however, much of that electromagnetic radiation would be in the invisible infrared light part of the spectrum. In fact, taking into account solely the star's visual luminosity, the planet actually only receives 20% of the visible light Earth does. Gliese 667Cc is said to be one of the most physically similar known exoplanets to Earth, with an Earth Similarity Index (ESI) value of 0.85. Gliese 667 Cc is heavier than Earth with a minimum mass of about 3.8 Earth masses.〔 Based on black body temperature calculation, GJ 667 Cc should absorb similar but slightly more overall electromagnetic radiation than Earth, making it a little bit warmer () and consequently placing it slightly closer to the "hot" inner edge of the habitable zone than Earth (). ==Comparison to Earth== The star Gliese 667 C could host at least 7 planets and 3 of those, all rocky planets (including Gliese 667 Cc), are potentially within the habitable zone. 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 667 Cc」の詳細全文を読む スポンサード リンク
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