Concept

HD 209458

Summary
HD 209458 is an 8th-magnitude star in the constellation Pegasus. It is a G0V star, and is thus very similar to the Sun. Because it is located at a distance of , it is not visible to the unaided eye. With good binoculars or a small telescope it should be easily detectable. In 1999, two teams working independently (one team consisted of astronomers at the Geneva Observatory, the Center for Astrophysics Harvard & Smithsonian, and the Wise Observatory; the second group was the California and Carnegie Planet Search team) discovered an extrasolar planet orbiting the star by using the radial velocity planet search method. Soon after the discovery, separate teams led by David Charbonneau and Gregory W. Henry were able to detect a transit of the planet across the surface of the star making it the first known transiting extrasolar planet. The planet received the designation HD 209458 b. Because the planet transits the star,
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