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Omega² Cygni : ウィキペディア英語版 | Omega2 Cygni
Omega2 Cygni (ω2 Cyg, ω2 Cygni) is a star in the constellation Cygnus. It has the traditional name Ruchba. It is a double star about 500 light years from Earth, consisting of a magnitude 5.44 star of spectral class M2 and a 6.6 magnitude star of spectral class A0. The stars are 256" apart and can be seen in binoculars. Because of the color contrast (red main star and blue companion), Ruchba is a beautiful object for amateur astronomers. ==References==
* http://skyatlas.rgbstore.com/index.jsp?rightAscension=20.522&declination=49.221&viewAngle=30
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Omega2 Cygni」の詳細全文を読む
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