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HD 123657, or ''BY Boötis'', is a variable star f magnitude 4.98–5.33V.〔 This makes it a dim naked eye star. It is a giant slow red irregular variable. The star is located near the end of the handle of the Big Dipper. == 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「HD 123657」の詳細全文を読む スポンサード リンク
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