XO-1b
XO-1b is an extrasolar planet. It is approximately 536 light years away. It was discovered in 2006 by the XO Project which is an international team of professional and amateur astronomers. They used the transit method to find XO-1b. It a little bit larger than Jupiter. It is a hot Jupiter. The Hubble Space Telescope found water in the atmosphere of the XO-1b.