FK Comae Berenices
Encyclopedia
FK Comae Berenices is a variable star
Variable star
A star is classified as variable if its apparent magnitude as seen from Earth changes over time, whether the changes are due to variations in the star's actual luminosity, or to variations in the amount of the star's light that is blocked from reaching Earth...

 that varies in apparent magnitude
Apparent magnitude
The apparent magnitude of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere...

 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.
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