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Albireo
Albireo (β Cyg, β Cygni, Beta Cyg, Beta Cygni) is the fifth brightest star in the constellation Cygnus. Although it has the Bayer designation ''beta'', it is fainter than Gamma Cygni, Delta Cygni, and Epsilon Cygni. Albireo appears to the naked eye to be a single star of magnitude 3 but through a telescope, even low magnification views resolve it into a double star. The brighter yellow star (actually itself a very close binary system) makes a striking colour contrast with its fainter blue companion star.〔(Albireo ), ''Stars'', Jim Kaler. Accessed on line October 23, 2013.〕
==Double star==
Albireo is about 〔The primary and secondary have different formal Hipparchos parallaxes. They are thought to be physically related and so at the same distance from Earth in astronomical terms, hence one or both derived distances are somewhat in error.〕 away from the Earth. When viewed with the naked eye, it appears to be a single star. However, in a telescope it readily resolves into a double star, consisting of Albireo A (amber, apparent magnitude 3.1), and Albireo B (blue-green, apparent magnitude 5.1).〔 Separated by 35 seconds of arc,〔Entry, (The Washington Double Star Catalog ), identifier 19307+2758, discoverer identifier STFA 43. Accessed on line July 9, 2008. 〕 the two components provide one of the best contrasting double stars in the sky due to their different colors. It is not known whether the two components are orbiting around each other in a physical binary system. If they are, their orbital period is probably at least 100,000 years.〔p. 46, ''The Monthly Sky Guide'', Ian Ridpath, Wil Tirion, Cambridge University Press, 2006, ISBN 0-521-68435-8.〕
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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