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Pi Cephei
Pi Cephei (π Cep) is a trinary star located in the constellation Cepheus.〔 The inner pair of stars orbits in 1.5 years while the outer companion completes one orbit in about 160 years.〔 ==Stellar system== Pi Cephei was found to have a visual companion star by Otto Wilhelm von Struve in 1843.〔 That the primary is itself a spectroscopic binary was first noticed by William Wallace Campbell in 1901 using photographic plates taken at Lick Observatory.〔
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「Pi Cephei」の詳細全文を読む
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