This is a wide binary star system with a projected separation of 100 astronomical units; indicating that the two stars are at least this distance apart.[16] The primary component is a solar-type main sequence star with a stellar classification of G1 V.[5] It has about 99% of the Sun's mass, 111% of the Sun's radius, and shines with 139% of the luminosity of the Sun.[16] This energy is being emitted from an outer envelope at an effective temperature of 5,922 K,[4] giving it the golden hue of a G-type star.[36] An examination of the primary component with the Spitzer space telescope failed to detect any infrared excess that might otherwise be an indication of a circumstellar debris disk.[16]
The companion is a slightly cooler star with an effective temperature of 5,811 K.[4] It has a stellar classification of G5 V Fe–0.8 CH–1,[5] indicating it is a chemically peculiar G-type main sequence star showing an under-abundance of iron and the molecule CH in its spectrum. As of 2008, it has an angular separation of 1.325 arcseconds along a position angle of 30.9° from the primary.[40]
This system is coeval with the Castor Moving Group of stars that share a common motion through space; hence it is a candidate member of that association. This suggests that the system is young; its estimated age is in the range of 180 to 370 million years, based upon the spectrum and X-ray luminosity, respectively.[22]
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