RW Cephei is a red hypergiant star in the constellation Cepheus. One of the largest stars known, RW Cephei is estimated at 1,260-1,610 solar radii. RW Cephei, while nearly as large as the orbit of Jupiter, is the largest star in the constellation of Cephus, dwarfing V354 Cephei and VV Cephei A. RW Cephei is also a semi-regular variable star of type LC. Its surface is subject to pulsations in temperature and luminosity. Over the past 50 to 70 years it has varied from classes G8 to M0 with no discernable pattern.
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