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Sigma Coronae Borealis is a multiple star system in the constellation Corona Borealis, the main components of which are three sunlike stars. Appearing as a single star of apparent magnitude 5.64 to the unaided eye, Sigma can be separated into Sigma and Sigma when observed with a telescope. The two take 726 years to orbit each other. Sigma is a yellow main sequence star of spectral type G1V and weighing around 1 solar mass. Sigma is a spectroscopic binary system composed of two stars very close (6 solar radii) together that orbit each other every 1.14 days.

References

1. ^ "Sigma Coronae Borealis - Variable of RS CVn type". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 23 November 2014.
2. Kaler, James B. "Sigma Coronae Borealis". Stars. University of Illinois. Retrieved 23 November 2014.

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