|—n , Latin genitive Cephei|
|See also Cepheid variable a faint constellation in the N hemisphere near Cassiopeia and the Pole Star|
|[from Latin Cēpheus named after the mythical king]|
|Cepheid (sē'fē-ĭd, sěf'ē-) Pronunciation Key
Any of a class of variable stars whose luminosity fluctuates with an extremely regular period. There is a strong correlation between the absolute magnitude of a Cepheid's luminosity and its period. By comparing the apparent magnitude of a Cepheid to the absolute magnitude corresponding to its period, it is possible to determine fairly accurately how distant the Cepheid is from Earth. Also called Cepheid variable.
|Cepheus (sē'fys', -fē-əs) Pronunciation Key
A constellation in the Northern Hemisphere near Cassiopeia and Draco.