High Quality Content by WIKIPEDIA articles! Xi Bootis is a binary star system 22 light years away from Earth. It is the nearest visible star in the constellation Bootes. The primary star in this system, ? Bootis A, is a BY Draconis variable with an apparent magnitude that varies from +4.52 to +4.67 with a period just over 10 days long, and is classified as a yellow G-type main sequence dwarf. Small velocity changes in the orbit of the companion star, ? Bootis B, an orange K-type main sequence dwarf, indicate the presence of a small companion that is less than nine times the mass of Jupiter.[citation needed] The AB binary can be resolved and displays a gorgeous sight even through smaller telescopes. The binary system contains some of the closest, young solar-type stars to the Sun, with a system age of about 200 million years old.

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