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Sigma Coronae Borealis, TZ Coronae Borealis, HD 146361, BD+34° 2750, HIP 79607, GC 21863, SAO 65165.
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.
^ Kaler, James B. "Sigma Coronae Borealis". Stars. University of Illinois. Retrieved 23 November 2014.
^ Raghavan, Deepak; McAlister, Harold A.; Torres, Guillermo; Latham, David W.; Mason, Brian D.; Boyajian, Tabetha S.; Baines, Ellyn K.; Williams, Stephen J.; ten Brummelaar, Theo A.; Farrington, Chris D.; Ridgway, Stephen T.; Sturmann, Laszlo; Sturmann, Judit; Turner, Nils H. (2009). "The Visual Orbit of the 1.1 Day Spectroscopic Binary σ2 Coronae Borealis from Interferometry at the Chara Array". The Astrophysical Journal. 690 (1): 394–406. Bibcode:2009ApJ...690..394R. doi:10.1088/0004-637X/690/1/394.{{cite journal}}: CS1 maint: multiple names: authors list (link)
