RW Cephei
Star
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RW Cephei is a K-type hypergiant and a semirregular variable star in the constellation Cepheus, at the edge of the Sharpless 132 H II region and close to the small open cluster Berkeley 94. It is among the largest stars known with a radius of... Wikipedia
Radius: 663.6 million mi (1,535 R☉)
Surface temperature: 4,015 K
Spectral type: K2 0-Ia
Luminosity: 550,000 L☉
Magnitude: 6.52
Distance to Earth: 11,420 light years
Constellation: Cepheus