RW Cephei

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RW Cephei
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cepheus
Right ascension 22h 23m 07.02s
Declination +55° 57' 47.6"
Apparent magnitude (V) +6.52
Parallax (π) 0.81 ± 0.36 mas
Distance 11,500 assumed as member of Cep OB1[1] ly
Absolute magnitude (MV) -9.4[1]
Spectral type K2Ia0[citation needed]
Variable type SRd[citation needed]
Mass 40[citation needed] M
Radius 1,260-1,610[citation needed] R
Luminosity 555,000[1] L
Temperature 4015[2] K
Age ? years
Other designations
HD 212466, HIP 110504, SAO 34387
Database references

RW Cephei is an orange 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.


  1. ^ a b c Humphreys, R. M. (1978). "Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way". The Astrophysical Journal Supplement Series 38: 309. doi:10.1086/190559.  edit
  2. ^ 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 Society 407 (2): 1203. doi:10.1111/j.1365-2966.2010.16965.x.  edit

See also[edit]

<<< 7. VV Cephei A 9. KY Cygni/VY Canis Majoris >>>