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DL Crucis
DL Crucis is a variable star in the constellation Crux. It is a blue-white supergiant of spectral type B1.5Ia, with a radius around 40 times and a mass 30 times that of the Sun. An Alpha Cygni variable, it ranges between apparent magnitudes 6.24 and 6.28 over a period of roughly 2 days 21 hours.〔 Hence it is just visible with the unaided eye in an outer suburban/rural transition sky. ==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「DL Crucis」の詳細全文を読む
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