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Upsilon Ursae Majoris (Upsilon UMa, υ Ursae Majoris, υ UMa) is a binary star in the constellation Ursa Major. It is approximately 115 light years from Earth. The primary component, Upsilon Ursae Majoris A, is a yellow-white F-type subgiant with a mean apparent magnitude of +3.78. It is classified as a Delta Scuti type〔 variable star and its brightness varies from magnitude +3.68 to +3.86 with a period of 3.18 hours. It has a projected rotational velocity of , an effective temperature of 7,080 K, and a luminosity 29–30 times that of the Sun.〔 The companion, Upsilon Ursae Majoris B, is a magnitude +11.5 star, 11.3 arcseconds away from the primary. ==Naming== *With τ, h, φ, 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 υ Ursae Majoris, 44 Lyncis, φ Ursae Majoris, θ Ursae Majoris, 15 Ursae Majoris and 18 Ursae Majoris. Consequently, υ Ursae Majoris itself is known as (, (英語:the first 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「Upsilon Ursae Majoris」の詳細全文を読む スポンサード リンク
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