T Cephei
Encyclopedia
T Cephei is a Mira variable
Mira variable
Mira variables , named after the star Mira, are a class of pulsating variable stars characterized by very red colors, pulsation periods longer than 100 days, and light amplitudes greater than one magnitude in infrared and 2.5 magnitude in visual...

 hypergiant star in the constellation Cepheus
Cepheus
Cepheus may refer to:In Greek Mythology:* Cepheus, King of Aethiopia, in Greek mythology* Cepheus, King of Tegea, the king of Tegea, Arcadia in Greek mythologyIn Astronomy:...

. With its radius of 540 solar radii, it is one of the larger known stars.
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