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High Quality Content by WIKIPEDIA articles! XO-1 is a magnitude 11 yellow dwarf star located approximately 600 light-years away in the constellation Corona Borealis. XO-1 has a mass and radius similar to the Sun The SuperWASP project has observed and classified this star as a variable star, perhaps due to the eclipsing planet. This star is not listed in the General Catalog of Variable Stars. In 2006 the extrasolar planet XO-1b was discovered orbiting XO-1 by the transit method using the XO Telescope. This international team of professional and amateur astronomers discovered a Jupiter-sized planet orbiting around XO-1. The team, led by Peter McCullough of the Space Telescope Science Institute in Baltimore, includes four amateur astronomers from North America and Europe.