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Gliese 54 (GJ 54 / HIP 5496 / LHS 1208)〔(NSV 427 - Variable Star ) (SIMBAD)〕 is a star near the Solar System located at 26.6 light years away. It is located in the constellation of Tucana, close to the edge, almost in the neighboring Hydrus. It is below the threshold brightness to be observable eye with an apparent magnitude of +9.80,.〔 Gliese 54 is a red dwarf of spectral type M2 with an effective temperature of 4250 K. In the SIMBAD database it appears listed as variable star, getting the provisional variable designation NSV 427.〔 It has a companion with which it forms a binary system whose orbital period is 427 ± 9 days. The companion, a red dwarf whose brightness is ~1 magnitude lower than Gliese 54, has been resolved with the instrument NICMOS installed in the Hubble Space Telescope. The semimajor axis projected from the orbit is 19.0 milliarcseconds; plausible for a total mass of 0.5 solar masses, the relationship between the masses of the components ''q'' = M2 / M1 is equal to 0.83. The known stars closer to Gliese 54 are ζ Tucanae, solar analog 3.1 light years, and β Hydri 5.1 light years〔(Stars Within 15 light-years of Cape Photographic Durchmusterung -68 ° 41 (The Internet Stellar Database) )〕 ==See also == * List of nearest stars and brown dwarfs 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 54」の詳細全文を読む スポンサード リンク
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