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Delta Cephei

27 Cephei

Proper NameNone
Bayer DesignationDelta Cephei
Flamsteed Number27 Cephei
BSC8571
HD213306
ConstellationCepheus
Right Ascension22h 29m 10s
Declination+58° 24' 55"
Distance865 light years
265 parsecs
MagnitudeApparent: +4.1
Absolute: -3.1
Spectral ClassF5Ib Bright Yellow Supergiant
Optimum VisibilitySeptember (Usually visible from northern latitudes)

This highly luminous yellow star lies nearly 1,000 light years from Earth, in the southern reaches of the constellation Cepheus. This is the prototype of the Cepheid variables, stars whose brightness changes over a period dictated by their mass. This useful feature allows their distance to be computed.

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