39_Boötis
39 Boötis
Star in the constellation Boötes
39 Boötis is a triple star[3] system located around 224[1] light years away from the Sun in the northern constellation of Boötes.[10] It is visible to the naked eye as a faint, yellow-white hued star with a combined apparent magnitude of 5.68.[2] The system is moving closer to the Earth with a heliocentric radial velocity of −31 km/s.[5]
The magnitude 6.36[3] primary, component A, is actually a double-lined spectroscopic binary system with an orbital period of 12.822 days, an eccentricity of 0.39,[7] and an angular separation of 2.021 mas. It has a combined stellar classification of F8V,[4] matching an F-type main-sequence star, with individual massed of 1.29 and 1.05[8] times the mass of the Sun. Component B is of magnitude 6.72[3] with a class of F7V[4] and 1.25[8] solar masses. The A–B pair have a separation of 2.9″ and a period of 1,347.653 years.[8] This system is a source of X-ray emission with a luminosity of 41.4×1028 erg s−1.[11]
It was a transferred by Jérôme Lalande from Boötes to Quadrans Muralis.[12] Later when the International Astronomical Union officially recognised constellations, Quadrans Muralis became obsolete, so this star was moved back to Boötes.