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Phi Ursae Majoris (Phi UMa, φ Ursae Majoris, φ UMa) is binary star in constellation of Ursa Major, which is separated in 0.245 arcseconds. Both of components are white A-type subgiant.〔(PHI UMA (Phi Ursae Majoris) )〕 It is approximately 436 light years from Earth. Phi Ursae Majoris is moving through the Galaxy at a speed of 21.6 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,000 and 46,000 light years from the center of the Galaxy.〔(Phi Ursae Majoris (HIP 48402) )〕 Phi Ursae Majoris will come closest to the Sun 4.7 million years from now when it will brighten to magnitude 3.88 from a distance of 370 light years.〔 ==Naming== *With τ, h, υ, θ, e, and f, it composed the Arabic asterism ''Sarīr Banāt al-Na'sh'', the Throne of the daughters of ''Na'sh'', and ''al-Haud'', the Pond, *In Chinese, (), meaning ''Administrative Center'', refers to an asterism consisting of φ Ursae Majoris, υ Ursae Majoris, θ Ursae Majoris, 15 Ursae Majoris and 18 Ursae Majoris. Consequently, φ Ursae Majoris itself is known as (, (英語:the Third Star of Administrative Center).).〔 (AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 16 日 )〕 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「Phi Ursae Majoris」の詳細全文を読む スポンサード リンク
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