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Tau Hydrae
The Bayer designation Tau Hydrae (τ Hya, τ Hydrae) is shared by two star systems, τ¹ Hydrae and τ² Hydrae, in the constellation Hydra. The two stars are separated by 1.74° in the sky. This star (τ¹ Hya and τ² Hya), along with ι Hya and the 5th‑magnitude 33 Hya (A Hydrae), were Ptolemy's Καμπή (Kampē); but Kazwini knew them as ʽUḳdah, the Knot. ==τ¹ Hydrae== Tau-1 Hydrae is a binary star lying 56 light years from Earth. It is a spectral type F6 main sequence star which has an apparent magnitude of +4.59.
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「Tau Hydrae」の詳細全文を読む
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