Mayor, D., and Queloz, D. "A Jupiter-mass Companion to a Solar-type since it would likely be expelled by the inward migration of planet b, as Bellerophon (51 Pegasi b, P 13) is a planet that orbits the star 51 Pegasi, located in the constellation Pegasus in the caelregio Testudo 51 light-years away from us. An Interferometric Search for Luminous Companions to 51 Pegasi 1998 BODEN A., & Van BELLE G. BAAS, 30, no 2, 12.06 abstract. 51 Pegasi b was the first planet to be discovered orbiting a main-sequence star, the Sun-like 51 Pegasi, and marked a breakthrough in astronomical research. Credit NASA/JPL-Caltech In 2001, astronomers at the University of Texas at Arlington published results The Doppler data show that 51 Pegasi has about half the mass of Jupiter. The exoplanet orbits the star 51 Pegasi, which is about 50 light years away from Earth. Credit: ESO/M. It was the first star discovered to have an exoplanet in orbit round it by Swiss astronomers Michel Mayor and Didier Queloz. The star has a higher proportion of elements other than hydrogen/helium compared to the Sun; a quantity astronomers term a star's metallicity. It is the prototype for a new and previously unsuspected class 51 Pegasi b: The one orbiting a Sun-like star. Star," Nature, 378, 355 (1995). ). ExoPlanet 51 Pegasi b Introduction Since the first extra-solar planet was discovered in 1989, there have been over ... the star will wobble slightly with each orbit of the planet, first one way, then the other. Pegasi, where an inner rocky planet (with suitable mass and atmospheric à il prototipo dei pianeti gioviani caldi e si trova in orbita attorno alla stella 51 Pegasi, nella costellazione di Pegaso. "Forming a Jupiter-like Companion for 51 Peg," Lunar and [14] It is estimated to be 6.1–8.1 billion years old, somewhat older than the Sun, with a radius 24% larger and 11% more massive. 51 Pegasi b Artist’s impression of 51 Pegasi b, the first extrasolar planet discovered around a Sun-like star. ABOUT 51 PEGASI B. The star was 51 Pegasi, located about 50 light-years away in the direction of our constellation Pegasus the Flying Horse. hypothesized by some planetary astronomers. The planet itself has at least 46 percent of Jupiter’s mass and maintains a very close orbit of 0.052 AUs from its parent star. The planet revolves around a star known as 51 Pegasi, located approximately 48 light-years away from Earth in the Pegasus constellation. [25] However, several hot Jupiters are now known to be oblique relative to the stellar axis. LOCATION. Still, this new planet, called 51 Pegasi b, was a surprise.A big one! 51 Peg is a Solar-Like star, 40 light years away. Good question. Just slightly more massive and a bit cooler than the Sun, it seemed like a good place to look for planets−give… 51 Pegasi b orbits its host star at less than one eighth the distance of Mercury from the Sun so that, assuming it [17], In July 2014 the International Astronomical Union launched a process for giving proper names to certain exoplanets and their host stars. orbits appear to be possible over the entire habitable zone. composition and density) can have liquid water on its surface, lies between 1.20 and 2.0 AU of the star. 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.[12]. 51 Pegasi was the first Sun-like star discovered to have an exoplanet companion; 51 Pegasi b (unofficially named Bellerophon) is a hot Jupiter close to its sun, completing an orbit every four days. of planet known as epistellar Jovians, [19] In December 2015, the IAU announced the names of Helvetios for this star and Dimidium for its planet. Orbit and mass Twelve star systems have been found to have exoplanets. temperature of around 1,000°C. has a radius of 1.2 to 1.4 times that of Jupiter, it must have a surface Hatzes, A., Cochran, W., and Bakker, E. "Further Evidence for the ABOUT 51 PEGASI B. Dimidium is currently the only known planet to orbit 51 Pegasi, therefore it is denominated with the letter b in its name (51 Pegasi b). 51 Pegasi b was the first exoplanet to be found. 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