Mu Cephei

red supergiant star
Mu Cephei compared to the Sun.

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 of 1,420 solar radii,[1] or a diameter of 1,977,000,000 kilometers, it is one of the largest stars known. Mu Cephei is also the "prototype" of the semiregular variable star type.

Related pagesEdit


  1. Emily M. Levesque1 et al 2005. "The effective temperature scale of galactic red supergiants: cool, but not as cool as we thought" Astrophysical Journal 628, 2. [1]