FK Comae Berenices

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FK Comae Berenices
Observation data
Epoch J2000      Equinox J2000
Constellation Coma Berenices
Right ascension 13h 30m 46.804s[1]
Declination +24° 13′ 57.75″[1]
Apparent magnitude (V) 8.17
Spectral type G5II
Variable type FK Com
Radial velocity (Rv) –16.6 km/s
Proper motion (μ) RA: –53.11 ± 0.74[1] mas/yr
Dec.: –19.71 ± 0.40[1] mas/yr
Parallax (π) 5.96 ± 0.68[1] mas
Distance approx. 550 ly
(approx. 170 pc)
Absolute magnitude (MV) 1.2[2]
Radius R
Luminosity 30 L
Other designations
HIP 65915, BD+24° 2592, HD 117555, SAO 82867.
Database references

FK Comae Berenices is a variable star that varies in apparent magnitude between 8.14m and 8.33m over a period of 2.4 days. It is the prototype for the FK Com class of variable stars. The variability of FK Com stars may be caused by large, cool spots on the rotating surfaces of the stars.


  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. ^ Korhonen, H., Berdyugina, S. V., Hackman, T., Duemmler, R., Ilyin, I. V., & Tuominen, I., , (1999). "Study of FK Comae Berenices. I. Surface images for 1994 and 1995". Astronomy and Astrophysics. p. 103. Retrieved June 18, 2014.