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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. HD 209458 is an 8th magnitude star in the constellation Pegasus. It is very similar to our Sun, and it is classified as a yellow dwarf. Because it is located at a distance of about 150 light years, it is not visible to the unaided eye. With good binoculars or small telescope it should be easily detectable. In 1999 two teams working independently discovered an extrasolar planet orbiting the star by using the radial velocity planet search method.