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Delta Cephei
Delta Cephei
(d Cep, d 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. At this distance, the
visual magnitude
of the star is diminished by 0.23 as a result of
extinction
caused by gas and dust along the line of sight. It is the prototype of the
Cepheid variable
stars that undergo periodic changes in luminosity.
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