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. The orbital period of 4.2 days is exactly what they reported. An Interpretation of the Orbital Period Difference Between Hot Jupiters and Giant Planets on Long-period Orbits 2010 JIN L. ApJ. Letters, 720, L211 paper. 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. Orbital Period is measured in Days. 8. 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. The early technique of tracking wobbling stars revealed one planet after another, many of them large “hot Jupiters” with tight, blistering orbits. Our velocity amplitude of 53 m/s compares favorably with their measured amplitude of 59 m/s, within their errors. It is the prototype for a new and previously unsuspected class of planet known as epistellar Jovians, or "hot Jupiters," with remarkably small orbits. 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. 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. 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. HD 217014, HIP 113357, HR 8729, TYC 1717-2193-1, 51 Pegasi, 51 Peg, BD+19 5036, Gliese 882: Spectral Type: G5V: Star Type based on Spectral Type ... to zero, the more circular the orbit is. where P and K are your values for 51 Pegasi b. Inclination is the angle at which the planet orbits compared to the ecliptic. Do not substitute a number for Jupiter’s mass; calculate the mass of 51 Pegasi b in terms of M Jupiter. Finding this fast-moving giant, known as 51 Pegasi b, kicked off what might be called the “classical” period of planet hunting. But 51 Pegasi b … The first planet found orbiting another Sun-like star has survived a challenge to its existence. Orbital Distance (a=AUs) Orbital Period (P=years) Orbital Eccentricity (e) Orbital Inclination (i=degrees) Mass (Earths) Diameter (Earths) Density (Earths) 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. 51 Pegasi b, abbreviated 51 Peg b, unofficially dubbed "Bellerophon", later named "Dimidium", is an extrasolar planet approximately 50 light-years away from Earth in the constellation of Pegasus. 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