Mu Cephei, is a red supergiant or hypergiant star in the constellation Cepheus. It is located at the edge of the IC 1396 nebula and is visually nearly 100,000 times brighter than the Sun.
The deep red color of Mu Cephei was noted by William Herschel, who described it as "a very fine deep garnet colour, such as the periodical star ο Ceti". It is thus commonly known as Herschel's "Garnet Star".
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.

Technical info: 
TS 80mm f6 APO triplet refractor -
Canon 40D dslr RGB - exposure: 1 hour 15 minutes.
Canon 40D dslr MONO + 12Nm Ha filter- exposure: 5 hours.
Total exposure: 6 hours 15 min