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Beta Cephei is a triple star system of the third magnitude in the constellation of Cepheus. Based on parallax measurements obtained during the Hipparcos mission, it is approximately 690 light-years distant from the Sun. It is the prototype of the Beta Cephei variable stars.
It consists of a binary pair together with a third companion. The binary's two components are themselves designated Beta Cephei Aa and Ab.
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