Ξ_Coronae_Borealis
Xi Coronae Borealis
Star in the constellation Corona Borealis
Xi Coronae Borealis (ξ CrB) is a binary star[3] system in the northern constellation of Corona Borealis. It is visible to the naked eye with a combined apparent visual magnitude of 4.85.[2] Based upon an annual parallax shift of 17.78 mas as seen from the Earth,[1] it is located about 183 light years from the Sun.
As of 2009, the pair had an angular separation of 91 mas along a position angle of 139.4°.[7] The brighter member, component Aa,[7] is an evolved K-type giant star with a stellar classification of K0 III.[3] It is a red clump star that is generating energy by helium fusion at its core.[8] The star has an estimated 2.36 times the mass of the Sun and has expanded to 8 times the Sun's radius. It is radiating 36 times the solar luminosity from its photosphere at an effective temperature of 4,853 K.[4]