XO -1, also known as BD 28 ° 2507 ( GSC 02041-01657 ), is a yellow dwarf, about 600 light-years away in the constellation of the Northern Crown. XO -1 has a mass and a diameter that is similar to our sun.
2006 saw a team of professional and amateur astronomers a Jupiter-sized exoplanets (XO -1b), the XO- 1 orbits. The team consisted of amateur astronomers from North America and Europe, and was directed by Peter McCullough of the Space Telescope Science Institute in Baltimore.
The planet discovered was confirmed by observations of the Harlan J. Smith Telescops and the Hobby - Eberly Telescope at McDonald Observatory of the University of Texas.