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Omega Scorpii : ウィキペディア英語版 | Omega Scorpii
The Bayer designation Omega Scorpii (ω Sco, ω Scorpii) is shared by two stars, ω¹ Scorpii and ω² Scorpii, in the constellation Scorpius. They are separated by 0.24° on the sky. Omega Scorpii also has the traditional name Jabhat al Akrab, which is derived from the Arabic جبهة العقرب ''jabhat() al-caqrab'' meaning "() forehead of the scorpion". ==ω¹ Scorpii== Omega-1 Scorpii is a blue-white B-type dwarf with an apparent magnitude of +3.93. It is approximately 424 light years from Earth. Omega-1 Sco is one of the most massive members of the Upper Scorpius subgroup of the Scorpius-Centaurus Association, a group of thousands of young stars with mean age 11 million years at distance 470 light years (145 parsecs). A recent analysis of the HR diagram position for the star〔 estimates its effective temperature to be 26,550 Kelvin with a luminosity of 9,120 Suns, consistent with an isochronal age of 5 million years and an estimated mass of 11 solar masses.
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