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S Persei

S Persei
Observation data
Epoch J2000      Equinox J2000
Constellation Perseus
Right ascension 2h 22m 51.709s
Declination +58° 31' 11.45"
Apparent magnitude (V) 9.23v
Characteristics
Spectral type M3Iaev[1]-M4.5I[2]
B−V color index 2.65[2]
Variable type Semiregular[1]
Astrometry
Radial velocity (Rv) -39.71[1] km/s
Proper motion (μ) RA: -2.70[1] mas/yr
Dec.: -0.29[1] mas/yr
Parallax (π) 1.66 mas
Distance 8,200 ly
(2,510 pc)
Absolute magnitude (MV) -6.36
Details
Radius 780-1,230[2] R
Luminosity 88,000 - 221,000[2] L
Temperature ~3,500[2] K
Other designations

S Persei is a red supergiant or hypergiant located in the Double Cluster in Perseus, north of the cluster NGC 869. It is a representative of the semiregular variables, whose periods of variation are subject to more irregularities than those of Mira variable red supergiants.

Many of the visually bright (5th - 7th magnitude) variable stars belong to this class of semiregulars, as these stars are extremely large and luminous, and hence visible across long distances. S Persei is as much as 1000 times the sun's diameter.

See also

References

  1. ^ a b c d e "SIMBAD basic query result: VY Canis Majoris". SIMBAD, Centre de Données astronomiques de Strasbourg. Retrieved May 20, 2012. 
  2. ^ a b c d e Emily M. Levesque, Philip Massey, K. A. G. Olsen, Bertrand Plez, Eric Josselin, Andre Maeder, and Georges Meynet (August 2005). "The Effective Temperature Scale of Galactic Red Supergiants: Cool, but Not As Cool As We Thought". The Astrophysical Journal 628 (2): 973–985.  


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