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51 Pegasi b is a gas giant exoplanet that orbits a G-type star. ABOUT 51 PEGASI B. Helvetios (51 Pegasi) Star Facts. The first planet found orbiting another Sun-like star has survived a challenge to its existence. Its mass is 0.46 Jupiters, it takes 4.2 days to complete one orbit of its star, and is 0.0527 AU from its star. Its discovery was announced in 1995. An artist's impression of the first planet orbiting a sunlike star beyond the solar system, 51 Pegasi b, a massive gas giant orbiting its planet every 4 days. 51 Peg is a Solar-Like star, 40 light years away. 51 Pegasi b (abbreviated 51 Peg b), sometimes unofficially named Bellerophon, is an extrasolar planet approximately 50 light-years away in the constellation of Pegasus. In October 1995 astronomers in Switzerland announced that 51 Pegasi, a solar-type star 50 light-years distant, is … It is the prototype for a new and previously unsuspected class of planet known as epistellar Jovians, or "hot Jupiters," with remarkably small orbits. We have obtained 27 independent spectra of 51 Peg using the 3-meter telescope at Lick Observatory. You can see the motion of the star and planet around their common center of mass, and the corresponding signal we detect. It is notable for being the first planet discovered around an ordinary star, and is the first hot Jupiter found. 51 Pegasi (abbreviated 51 Peg), formally named Helvetios / h ɛ l ˈ v iː ʃ i ə s /, is a Sun-like star located 50.45 light-years (15.47 parsecs) from Earth in the constellation of Pegasus.It was the first main-sequence star found to have an exoplanet (designated 51 Pegasi b, officially named Dimidium, formerly unofficially dubbed Bellerophon) orbiting it. Still, this new planet, called 51 Pegasi b, was a surprise.A big one! Credit: Alysa Obertas (@AstroAlysa) Through their survey, the authors found a strange object orbiting the star 51 Pegasi, something twice the size of Jupiter, but about 7 times closer to its star than Mercury is to our sun. 51 Pegasi is a yellow-orange main sequence dwarf star of spectral and luminosity type G4-5 Va, but it had been previously classified as G2-2.5 and sometimes as a subgiant (IV). The exoplanet orbits the star 51 Pegasi, which is about 50 light years away from Earth. If confirmed, this would be the first detected planetary system around a normal star. LOCATION. Bellerophon (51 Pegasi b, P13) is a planet that orbits the star 51 Pegasi, located in the constellation Pegasus in the caelregio Testudo 51 light-years away from us. 51 Pegasi is a Sun-like star around which has been discovered a planet, 51 Pegasi b, with about half the mass of Jupiter.With the exception of some pulsar planets, 51 Pegasi b was the first exoplanet to be found. On Oct. 6, Michel Mayor and Didier Queloz at Geneva Observatory announced that 51 Pegasus has a planet orbiting it. The Planet of 51 Pegasi Does Exist Adapted from Sky & Telescope, March 1998 THERE'S GOOD NEWS FOR EVERYONE who would like the universe to be full of interesting worlds. That wobble is due to the gravity of a massive object near the star: a planet that has about the same mass as Jupiter yet has an orbit that is much smaller than Mercury's around the Sun. It was the first star discovered to have an exoplanet in orbit round it by Swiss astronomers Michel Mayor and Didier Queloz. 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