V354 Cephei

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V354 Cephei
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cepheus
Right ascension 22h 33m 34.64s[1]
Declination +58° 53′ 47.1″[1]
Apparent magnitude (V) 10.82 to 11.35[2]
Spectral type M2.5Iab:[1]
B−V color index 2.8[1]
Variable type LC[2]
Distance ~9,000[3][4] ly
(~3,000[3][4] pc)
Absolute magnitude (MV) -7.6 (variable)[5]
Radius 690-1,520[5] R
Luminosity 400,000[5] L
Surface gravity (log g) −0.5[5] cgs
Temperature 3,650[5] K
Other designations
V354 Cep.
Database references

V354 Cephei is a red supergiant star located within the Milky Way. It is an irregular variable located approximately 9,000 light-years away from our Sun, and is currently considered one of the largest known stars, with a radius estimate of 690-1,520 times that of the Sun, or 1,060,000,000 km at its greatest extent.[5] Assuming the upper size estimate is correct, if it were placed in the center of our Solar System, it would extend to 7 AU, between the orbits of Jupiter and Saturn.

See also[edit]


  1. ^ a b c d V* V354 Cep -- Pulsating variable Star, database entry, SIMBAD. Accessed on line November 12, 2010.
  2. ^ a b V354 Cep, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 12, 2010.
  3. ^ a b V354 Cephei is in the Cep OB1 association, which has an adopted estimated distance modulus of 12.2. See Tables 1 and 2, Levesque et al. 2005.
  4. ^ a b "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought", Emily M. Levesque, Philip Massey, K. A. G. Olsen, Bertrand Plez, Eric Josselin, Andre Maeder, and Georges Meynet, The Astrophysical Journal 628, #2 (August 2005), pp. 973-985, doi:10.1086/430901, Bibcode2005ApJ...628..973L.
  5. ^ a b c d e f Table 4, Levesque et al. 2005

External links[edit]