U Coronae Borealis

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U Coronae Borealis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Borealis
Right ascension 15h 18m 11.35252s[1]
Declination +31° 38′ 49.4159″[1]
Spectral typeB6 V + F8 III-IV[1]
Other designations
BD+32° 2569, HD 136175, HIP 74881, SAO 64619[1]

U Coronae Borealis (U CrB) is an Algol-type eclipsing binary star system in the constellation Corona Borealis. Its apparent magnitude varies between 7.66 and 8.79 over a period of 3.45 days[2] The component stars are a blue-white main sequence star of spectral type B6V and a cooler yellow-white subgiant star of spectral type F8III-IV.[3]


  1. ^ a b c d "V* U CrB". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 10 March 2015.
  2. ^ VSX (4 January 2010). "U Coronae Borealis". AAVSO Website. American Association of Variable Star Observers. Retrieved 10 March 2015.
  3. ^ Ibanoǧlu, C.; DervişoǧLu, A.; Ćakırlı, Ö.; Sipahi, E.; Yüce, K. (2012). "Carbon deficiencies in the primaries of some classical Algols". Monthly Notices of the Royal Astronomical Society. 419 (2): 1472–79. arXiv:1109.1939. Bibcode:2012MNRAS.419.1472I. doi:10.1111/j.1365-2966.2011.19812.x.