S Coronae Borealis

Not to be confused with Sigma Coronae Borealis.
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) 5.3 – 13.6[2]
Characteristics
Spectral type M7e[3]
U−B color index 0.36[1]
B−V color index 1.71[1]
Variable type Mira[2]
Astrometry
Radial velocity (Rv)-5.12[4] km/s
Proper motion (μ) RA: -7.73[1] mas/yr
Dec.: -13.03[1] mas/yr
Parallax (π)2.39 ± 0.17 mas[5]
Distance418+21
−18[5] pc
Absolute magnitude (MV)-0.8±0.3[6]
Details
Mass1.34[7] M☉
Radius308[7] (537–664)[8] R☉
Luminosity5,897[9] L☉
Temperature2,864[7] (2,350–2,600)[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
SIMBADdata
Light curve for the Mira variable S Coronae Borealis over six years

S Coronae Borealis (S CrB) is a Mira variable star in the constellation Corona Borealis. Its apparent magnitude varies between 5.3 and 13.6, with a period of 360 days—just under a year. Within the constellation, it lies to the west of Theta Coronae Borealis, and around 1 degree southeast of the eclipsing binary star U Coronae Borealis.[10]

  1. ^ a b c d e f Cite error: The named reference hipparcos was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference AAVSO was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference bieging was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference famaey was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference vlemmings was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference absmag1977 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference takeuti was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference wallerstein was invoked but never defined (see the help page).
  9. ^ McDonald, I.; De Beck, E.; Zijlstra, A. A.; Lagadec, E. (2018). "Pulsation-triggered dust production by asymptotic giant branch stars". Monthly Notices of the Royal Astronomical Society. 481 (4): 4984. arXiv:1809.07965. Bibcode:2018MNRAS.481.4984M. doi:10.1093/mnras/sty2607. S2CID 118969263.
  10. ^ Plotner, Tammy; Vogt, Ken (2009). The Night Sky Companion: A Yearly Guide to Sky-Watching 2009. The Patrick Moore Practical Astronomy Series. Springer Science & Business Media. p. 194. ISBN 978-0387795096.