Delta Cephei ( δ Cep , δ Cephei ) is the Bayer designation for a quadruple star system located approximately 887 light-years away in the northern circumpolar constellation of Cepheus , the King .
Delta Cephei ( δ Cep , δ Cephei ) is a binary star system about 887 light-years away in the northern constellation of Cepheus , the King .