RR Coronae Borealis

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Not to be confused with R Coronae Borealis.
RR Coronae Borealis
Observational data
Epoch: J2000.0 [1]
Constellation: Corona Borealis [1]
Right ascension: 15h 41m 26.22899s [1]
Declination: +38° 33′ 26.5958″ [1]
Apparent magnitude: 7.3-8.2[2]

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).[1] It varies between magnitudes 7.3 and 8.2 over 60.8 days.[2] 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.[3]


  1. ^ a b c d e f SIMBAD, RR Coronae Borealis (accessed 20 February 2013)
  2. ^ a b Otero, Sebastian Alberto (15 August 2011). "RR Coronae Borealis". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 20 July 2014. 
  3. ^ 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:1208.2037free to read. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.