Upsilon Coronae Borealis

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Upsilon Coronae Borealis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Borealis
Right ascension 16h 16m 44.78703s[1]
Declination +29° 09′ 00.9474″[1]
Apparent magnitude (V) 5.78[2]
Spectral type A3V[3]
U−B color index +0.10[2]
B−V color index +0.07[2]
Radial velocity (Rv) 0.8±1.0[4] km/s
Proper motion (μ) RA: +23.10[1] mas/yr
Dec.: −16.00[1] mas/yr
Parallax (π) 4.89 ± 0.53[1] mas
Distance approx. 670 ly
(approx. 200 pc)
Absolute magnitude (MV) −0.72[5]
Radius 1.5[6] R
Luminosity 151[7] L
Temperature 8,098[7] K
Rotational velocity (v sin i) 112[3] km/s
Other designations
υ CrB, 18 CrB, BD+29° 2803, HD 146738, HIP 79757, HR 6074, SAO 84281[8]
Database references

Upsilon Coronae Borealis, Latinized from υ Coronae Borealis, is a solitary[9] star in the northern constellation of Corona Borealis. It is faintly visible to the naked eye with an apparent visual magnitude of 5.78.[2] Located around 204 parsecs (670 ly) distant, it is a blue-white main-sequence star of spectral type A3V,[3] a star that is currently fusing its core hydrogen.


  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. 
  2. ^ a b c d Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J. 
  3. ^ a b c Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785Freely accessible, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224. 
  4. ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048Freely accessible, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61. 
  5. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971Freely accessible, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  6. ^ Pasinetti Fracassini, L. E.; Pastori, L.; Covino, S.; Pozzi, A. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (3rd ed.), 367: 521–524, arXiv:astro-ph/0012289Freely accessible, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451. 
  7. ^ a b McDonald, I.; et al. (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. 
  8. ^ "ups CrB". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-04-25. 
  9. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878Freely accessible, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.