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51 Pegasi b, officially named Dimidium / d ɪ ˈ m ɪ d i ə m /, is an extrasolar planet approximately 50 light-years (15 parsecs) away in the constellation of Pegasus.It was the first exoplanet to be discovered orbiting a main-sequence star, [3] the Sun-like 51 Pegasi, and marked a breakthrough in astronomical research.
51 Pegasi (abbreviated 51 Peg), formally named Helvetios / h ɛ l ˈ v iː ʃ i ə s /, [12] is a Sun-like star located 50.6 light-years (15.5 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) orbiting it.
One of the best-known hot Jupiters is 51 Pegasi b. Discovered in 1995, it was the first extrasolar planet found orbiting a Sun-like star . 51 Pegasi b has an orbital period of about four days.
51 Pegasi b: 51 Pegasi: 1995 First convincing exoplanet discovered around a Sun-like star. [2] While the minimum mass of HD 114762 b was high enough (11 Jupiter-masses) that it could be a brown dwarf, 51 Peg b's minimum mass meant that it almost certainly was near the mass of Jupiter. First planet discovered via transit: OGLE-TR-56 b: OGLE-TR ...
51 Pegasi was the first Sun-like star discovered to have an exoplanet companion; [45] 51 Pegasi b (unofficially named Bellerophon, [46] officially named Dimidium [47]) is a hot Jupiter close to its star, completing an orbit every four days.
In July 1995, the pair's survey of 51 Pegasi affirmed that there was an exoplanet orbiting it, identified as 51 Pegasi b, which was later classified as a hot-Jupiter–type planet. This was the first exoplanet to be found orbiting a main-sequence star, as opposed to planets that orbited the remains of a star. [17]
In 1995, the first exoplanet found orbiting a main-sequence star, 51 Pegasi b, was discovered by two scientists of the observatory, Michel Mayor and Didier Queloz, using the radial velocity method with the 1.9-metre telescope at Haute-Provence Observatory in France. [2]
51 Pegasi b, HD 209458 b, KELT-9b: Hot Neptune: An extrasolar planet in an orbit close to its star (normally less than one astronomical unit away), with a mass similar to that of Uranus or Neptune. Gliese 436 b, LTT 9779 b: Inferior planets: Planets whose orbits lie within the orbit of Earth. [nb 1] Mercury and Venus: Inner planet