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Kappa Aquilae
Star in the constellation Aquila From Wikipedia, the free encyclopedia
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Kappa Aquilae is a star in the equatorial constellation of Aquila. Its name is a Bayer designation that is Latinized from κ Aquilae, and abbreviated Kappa Aql or κ Aql. This is a faint star with an apparent visual magnitude of +4.957,[3] which is bright enough to be seen with the naked eye in dark suburban skies. The annual parallax is only 1.98 mas,[2] which equates to a distance of approximately 1,700 light-years (520 parsecs) from Earth (with a 6% margin of error).
The spectrum of Kappa Aquilae matches a stellar classification of B0.5 III,[4] where the luminosity class of III is typically associated with evolved giant stars. It is spinning rapidly with a projected rotational velocity of 265 km/s[9] and in the past has been classified as a Be star, despite the lack of an 'e' in the class.[11] However, the weak emission is most likely coming from the outflow of a hot stellar wind rather than a decretion disk.[12] This is a star with 15.50 times the Sun's mass[6] and 12.5 times the radius of the Sun.[7] Massive stars like this are luminous; it is radiating 52,630 times the Sun's luminosity[6] from its outer atmosphere with an effective temperature of 26,500 K,[6] giving it the intense blue-white glow of a B-type star. It is only 11 million years of age.[4]
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Etymology
In Chinese, 右旗 (Yòu Qí), meaning Right Flag, refers to an asterism consisting of κ Aquilae, μ Aquilae, σ Aquilae, δ Aquilae, ν Aquilae, 42 Aquilae, ι Aquilae, HD 184701 and 56 Aquilae.[13] Consequently, the Chinese name for κ Aquilae itself is 右旗八 (Yòu Qí bā, English: the Eighth Star of Right Flag.)[14]
This star, together with η Aql, θ Aql, δ Aql, ι Aql and λ Aql were once part of the now-obsolete constellation Antinous.[15]
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References
External links
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