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53 Aquarii is the Flamsteed designation for a binary star 〔 system in the equatorial constellation of Aquarius. The combined apparent visual magnitude of the pair is a 5.56,〔 making it just visible to the naked eye in dark suburban skies. Based upon an annual parallax shift of 49.50 milliarcseconds for the first component, this system is located at a distance of approximately from Earth.〔 This is a wide binary star system with a projected separation of 100 astronomical units; indicating that the two stars are at least this distance apart.〔 The primary component is a solar-type main sequence star with a stellar classification of G1 V.〔 It has about 99% of the Sun's mass, 111% of the Sun's radius, and shines with 139% of the luminosity of the Sun.〔 This energy is being emitted from an outer envelope at an effective temperature of 5,922 K,〔 giving it the golden hue of a G-type star.〔 An examination of the primary component with the Spitzer space telescope failed to detect any infrared excess that might otherwise be an indication of a circumstellar debris disk.〔 The companion is a slightly cooler star with an effective temperature of 5,811 K.〔 It has a stellar classification of G5 V Fe–0.8 CH–1,〔 indicating it is a chemically peculiar G-type main sequence star showing an under-abundance of iron and the molecule CH in its spectrum. As of 2008, it has an angular separation of 1.325 arcseconds along a position angle of 30.9° from the primary.〔 This system is coeval with the Castor Moving Group of stars that share a common motion through space; hence it is a candidate member of that association. This suggests that the system is young; its estimated age is in the range of 180 to 370 million years, based upon the spectrum and X-ray luminosity, respectively.〔 ==References== 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「53 Aquarii」の詳細全文を読む スポンサード リンク
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