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, which is 1,435 by average. RW Cephei, which is nearly as large as the orbit of Jupiter, is the second largest star in the constellation of Cepheus, behind 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 discernible pattern.
^ abcHumphreys, R. M. (1978). "Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way". The Astrophysical Journal Supplement Series38: 309. doi:10.1086/190559.edit
^Davies, B.; Kudritzki, R. P.; Figer, D. F. (2010). "The potential of red supergiants as extragalactic abundance probes at low spectral resolution". Monthly Notices of the Royal Astronomical Society407 (2): 1203. doi:10.1111/j.1365-2966.2010.16965.x.edit