 The primary component is a bright giant star with a stellar classification of G2 II and about three and a half times the mass of the Sun.The interferometry-measured angular diameter of this star, after correcting for limb darkening, is , which, at its estimated distance, equates to a physical radius of more than 24 times the radius of the Sun.It is radiating 331 times the luminosity of the Sun from its expanded outer envelope at an effective temperature of 4,970 K. The rotation rate of the star slowed as it expanded, so it has a projected rotational velocity of 1.7 km s−1 with an estimated rotation period of 818 days.