Mu Cephei
star in the constellation Cepheus / From Wikipedia, the free encyclopedia
Mu Cephei, also known as Herschel's Garnet Star due to its red, garnet-like color, is a red hypergiant star in the Cepheus constellation. With a radius between 1,260 and 1,420 solar radii,[1][2] or a diameter between 1.7 and 2 billion kilometers, it is one of the largest stars known. This means Mu Cephei is twice the size of the more famous star Betelgeuse.[3] Mu Cephei is also 269,000 times brighter than the Sun.[4] Mu Cephei is also the "prototype" of the semiregular variable star type.
- Artist's picture
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/2/2b/MuCephi_sm.gif)