Which star is also known as Herschel's Garnet Star?

Mu Cephei, also known as Herschel's Garnet Star, is a red supergiant or hypergiant star in the constellation Cepheus. It appears garnet red and is located at the edge of the IC 1396 nebula. Since 1943, the spectrum of this star has served as the M2 Ia standard by which other stars are classified.

Mu Cephei is visually nearly 100,000 times brighter than the Sun, with an absolute visual magnitude of −7.6. It is also one of the largest known stars with an estimated radius over 1,000 times that of the sun, and were it placed in the Sun's position it would reach between the orbit of Jupiter and Saturn.