S Cephei

S Cephei is a red supergiant star, located in the constellation Cepheus. It is an enormous, luminous star nearing the end of its life, characterized by a large size and a cool surface temperature that gives it a reddish appearance. These stars are known for their variability, meaning their brightness changes over time due to processes like stellar pulsations. S Cephei's size and brightness can vary significantly, and it is an important object of study in understanding stellar evolution, especially for massive stars approaching the final stages of their life cycle.