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HD 21389
HD 21389 is a variable star in reflection nebula VDB 15, in the constellation Camelopardalis. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.〔 It is some 15 times as massive as the Sun. Only around 11 to 12 million years old, it has exhausted its core hydrogen fuel and swollen into a white supergiant.〔 Hohle and colleagues, using the parallax, extinction and analysis of spectrum, came up with a mass 14.95 ± 0.41 times that and luminosity 62,679 times that of the Sun.〔
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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