S Coronae Borealis

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S Coronae Borealis
Observation data
Epoch J2000      Equinox J2000
Constellation Corona Borealis
Right ascension 15h 21m 23.9561s[1]
Declination +31° 22′ 02.573″[1]
Apparent magnitude (V) 8.15.80[1]
Spectral type M7e[2]
U−B color index 0.36[1]
B−V color index 1.71[1]
Variable type Mira[3]
Radial velocity (Rv) -5.12[1] km/s
Proper motion (μ) RA: -7.73[1] mas/yr
Dec.: -13.03[1] mas/yr
Parallax (π) 1.85 ± 1.19[1] mas
Distance 433[4] pc
Absolute magnitude (MV) -0.8±0.3[5]
Radius 537-664[6] R
Luminosity 12,700[6] L
Temperature 2350-2600[6] K
Other designations
S Coronae Borealis, GSC 02563-01338, HD 136753, BD+31° 2725, HIC 75143, DO 15223, HIP 75143, GC 20662, SAO 64652.
Database references

S Coronae Borealis (S CrB) is a Mira-type long period variable star with a period of 360 days[7] in the constellation Corona Borealis. Its apparent magnitude varies between 5.8 and 14.1[3] Located around 1946 light-years distant, it shines with a luminosity approximately 16643 times that of the Sun and has a surface temperature of 3033 K.[8]


  1. ^ a b c d e f g h i "S Coronae Borealis". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 27 June 2014. 
  2. ^ Bieging, J. H.; Schmidt, G. D.; Smith, P. S.; Oppenheimer, B. D. (2006). "Optical Spectropolarimetry of Asymptotic Giant Branch and Post–Asymptotic Giant Branch Stars". The Astrophysical Journal 639 (2): 1053. doi:10.1086/499772.  edit
  3. ^ a b VSX (4 January 2010). "S Coronae Borealis". AAVSO Website. American Association of Variable Star Observers. Retrieved 27 June 2014. 
  4. ^ Vlemmings, W. H. T.; Van Langevelde, H. J.; Diamond, P. J.; Habing, H. J.; Schilizzi, R. T. (2003). "VLBI astrometry of circumstellar OH masers: Proper motions and parallaxes of four AGB stars". Astronomy and Astrophysics 407: 213. doi:10.1051/0004-6361:20030766.  edit
  5. ^ "The variable S Coronae Borealis". The SAO/NASA Astrophysics Data System. 1977. Retrieved 2010-12-22. 
  6. ^ a b c Bibcode1977JRASC..71..298W
  7. ^ Cotton, W. D.; Mennesson, B.; Diamond, P. J.; Perrin, G.; Coud� Du Foresto, V.; Chagnon, G.; Van Langevelde, H. J.; Ridgway, S.; Waters, R.; Vlemmings, W.; Morel, S.; Traub, W.; Carleton, N.; Lacasse, M. (2004). "VLBA observations of SiO masers towards Mira variable stars". Astronomy and Astrophysics 414: 275. doi:10.1051/0004-6361:20031597.  edit
  8. ^ McDonald, I.; Zijlstra, A. A.; Boyer, M.L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society 427 (1): 343–57. Bibcode:2012MNRAS.427..343M.