Mu Cephei

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,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.  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. Mu Cephei is also 269,000 times brighter than the Sun. Mu Cephei is also the "prototype" of the semiregular variable star type.

Related pages
 119 Tauri
 Pi1 Gruis
 Antares
 Betelgeuse
 VV Cephei
 VY Canis Majoris

 References 

Category:Red giants
Category:Variable stars
Category:Hypergiants