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Alpha Cephei
Alpha Cephei (α Cep, α Cephei) is a second magnitude star in the constellation of Cepheus near the northern pole. The star is relatively close to Earth at only 49 light years. It has the traditional name Alderamin, an Arabic name meaning ''"the right arm"''.
== Visibility ==
With a declination in excess of 62 degrees north, Alderamin is mostly visible to observers in the northern hemisphere, though the star is still visible to latitudes as far south as -27°, albeit just above the horizon. The star is circumpolar throughout all of Europe, northern Asia, Canada, and American cities as far south as San Diego. Since Alderamin has an apparent magnitude of about 2.5, the star is easily observable to the naked eye, even in light-polluted cities.
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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