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) 5.80[2]
Spectral type M7e[3]
U−B color index 0.36[1]
B−V color index 1.71[1]
Variable type Mira[4]
Radial velocity (Rv) -5.12[5] 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[6] pc
Absolute magnitude (MV) -0.8±0.3[7]
Radius 537-664[8] R
Luminosity 12,700[8] L
Temperature 2350-2600[8] K
Other designations
S Coronae Borealis, HD 136753, BD+31°2725, HIP 75143, GC 20662, SAO 64652, GSC 02563-01338, DO 15223, AAVSO 1517+31
Database references

S Coronae Borealis (S CrB) is a Mira-type long period variable star with a period of 360 days[9] in the constellation Corona Borealis. Its apparent magnitude varies between 5.8 and 14.1[4] 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.[10]


  1. ^ a b c d e f g Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237: 0. Bibcode:2002yCat.2237....0D. 
  3. ^ Bieging, John H.; Schmidt, Gary D.; Smith, Paul S.; Oppenheimer, Benjamin D. (2006). "Optical Spectropolarimetry of Asymptotic Giant Branch and Post–Asymptotic Giant Branch Stars". The Astrophysical Journal. 639 (2): 1053. Bibcode:2006ApJ...639.1053B. doi:10.1086/499772. 
  4. ^ a b VSX (4 January 2010). "S Coronae Borealis". AAVSO Website. American Association of Variable Star Observers. Retrieved 27 June 2014. 
  5. ^ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics. 430: 165. arXiv:astro-ph/0409579Freely accessible. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. 
  6. ^ 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. arXiv:astro-ph/0305405Freely accessible. Bibcode:2003A&A...407..213V. doi:10.1051/0004-6361:20030766. 
  7. ^ Feijth, H. (1977). "The variable S Coronae Borealis". Zenit. 4: 451. Bibcode:1977Zenit...4..451F. 
  8. ^ a b c Wallerstein, G. (1977). "Are long-period variables really pulsating". Journal of the Royal Astronomical Society of Canada. 71: 298. Bibcode:1977JRASC..71..298W. 
  9. ^ Cotton, W. D.; Mennesson, B.; Diamond, P. J.; Perrin, G.; Coudé 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. Bibcode:2004A&A...414..275C. doi:10.1051/0004-6361:20031597. 
  10. ^ 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. arXiv:1208.2037Freely accessible. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.