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21 Persei
21 Persei is an star in the constellation Perseus. Its apparent magnitude is 5.10. Located around distant, it is an hot blue star of spectral type B9. The star is an Alpha2 Canum Venaticorum variable, meaning that the star has a strong magnetic field chromium, silicon, and strontium spectral lines. 21 Persei's period is approximately 2.88 days ==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「21 Persei」の詳細全文を読む
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