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Zeta1 Scorpii
Zeta1 Scorpii (Zeta1 Sco, ζ1 Scorpii, ζ1 Sco) is a B-type hypergiant star in the constellation of Scorpius.〔 It has an apparent visual magnitude which varies between 4.66 and 4.86.〔 It is a member of the Scorpius OB1 association,〔 and the open star cluster NGC 6231, also known as the "northern jewel box" cluster. It is also one of the most luminous stars known in the Galaxy, with an estimated bolometric luminosity of nearly a million times the Sun's.
The stellar wind from this supergiant is expelling matter from the star at the rate of per year, or roughly the equivalent to the Sun's mass every 640,000 years.〔
ζ1 Scorpii forms a naked eye double with ζ2 Scorpii, but the stars are merely coincidentally near in the line of sight from Earth. ζ2 is a mere 155 light years distant and much less luminous in real terms. ζ1 Scorpii can also be distinguished from ζ2, due to the latter's orange hue especially in long-exposure photographs.
==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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