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Beta Cephei
Beta Cephei (β Cep, β Cephei) is a third magnitude star in the constellation Cepheus. It has the traditional name Alfirk (Arabic الفرقة ''al-firqah''), meaning ''"The Flock"'' (referring to a flock of sheep) This star, along with α Cep (Alderamin) and η Cep (Alkidr), were Al Kawākib al Firḳ (الكوكب الفرق), meaning "the Stars of The Flock" by Ulug Beg.〔Davis Jr., G. A., ("The Pronunciations, Derivations, and Meanings of a Selected List of Star Names," )''Popular Astronomy'', Vol. LII, No. 3, Oct. 1944, p. 16.〕 Beta Cephei is the prototype of the Beta Cephei variable stars.
== Visibility ==
Like the star Epsilon Draconis in the constellation of Draco, Alfirk is visible primarily in the northern hemisphere, given its extreme northern declination of 70 degrees and 34 minutes. The star is nevertheless visible to most observers throughout the world reaching as far south as cities like Harare in Zimbabwe, Santa Cruz de la Sierra in Bolivia or other settlements north ± 19° South latitude. The star is circumpolar throughout all of Europe, northern Asia, and North American cities as far south as Guadalajara in west central Mexico. All other locations around the globe having a latitude greater than ± 20° North will notice that the star is always visible in the night sky. Because Beta Cephei is a faint third magnitude star, it may be difficult to identify in most light polluted cities, though in rural locations the star should be easily observable.
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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