RR Coronae Borealis

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Not to be confused with R Coronae Borealis.
RR Coronae Borealis
Observation data
Epoch J2000      Equinox J2000
Constellation Corona Borealis
Right ascension 15h 41m 26.22899s[1]
Declination +38° 33′ 26.5958″[1]
Apparent magnitude (V) 8.40[2]
Spectral type M3[2]
Variable type LPV[2]
Radial velocity (Rv) -58.39[2] km/s
Proper motion (μ) RA: 20.24[1] mas/yr
Dec.: -32.44[1] mas/yr
Parallax (π) 2.93 ± 0.53[1] mas
Distance approx. 1,100 ly
(approx. 340 pc)
Other designations
RR CrB, BD+39° 2901, HD 140297, HIP 76844, SAO 64848, GC 21108, TYC 3053-1035-1, 2MASS J15412622+3833266
Database references

RR Coronae Borealis (RR CrB, HD 140297, HIP 76844) is a M3-type semiregular variable star located in the constellation Corona Borealis with a parallax of 2.93mas being a distance of 341 parsecs (1,110 ly).[2] It varies between magnitudes 7.3 and 8.2 over 60.8 days.[3] Located around 1228 light-years distant, it shines with a luminosity approximately 2180 times that of the Sun and has a surface temperature of 3309 K.[4]


  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c d e "RR CrB". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 December 2016. 
  3. ^ Otero, Sebastian Alberto (15 August 2011). "RR Coronae Borealis". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 20 July 2014. 
  4. ^ 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.