hd 209458

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 (spectral class G0 V). 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 the California and Carnegie Planet Search Team discovered an extrasolar planet orbiting the star by using the highly successful radial velocity planet search method. Soon after the discovery, Gregory W. Henry was able to detect the 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 and was later dubbed as "Osiris". Because the planet transits the star, the star is dimmed by about 2% every 3.5 days making it an extrinsic variable. The variable star designation for HD 209458 is V376 Pegasi.

External links

SIMBAD entry

209458 108859

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