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Zeta2 Scorpii : ウィキペディア英語版
Zeta2 Scorpii


:''For other stars with this Bayer designation, see Zeta Scorpii.''
Zeta2 Scorpii (Zeta2 Sco, ζ2 Scorpii, ζ2 Sco) is a K-type orange giant star in the constellation of Scorpius.〔 It has an apparent visual magnitude which varies between 3.59 and 3.65,〔 and is located near the blue-white supergiant star ζ1 Scorpii in our sky. In astronomical terms, ζ2 is much closer to the Sun and unrelated to ζ1 except for line-of sight co-incidence. ζ1 is 5,700 light-years away and probably an outlying member of open star cluster NGC 6231 (also known as the "northern jewel box" cluster), whereas ζ2 is a mere 151 lightyears distant and thus much less luminous in real terms. ζ2 can also be distinguished from its optical partner, ζ1, because of its orangish colour especially in long-exposure astrophographs.
==References==



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