description 51 Pegasi b Overview
51 Pegasi b is a gas giant exoplanet orbiting the Sun-like star 51 Pegasi. Its discovery in 1995 marked the first confirmation of an exoplanet around such a star. This “hot Jupiter” planet’s existence was determined through radial velocity measurements, offering scientists a crucial early example for studying planetary systems beyond our own. The research by Mayor and Queloz significantly advanced the field of exoplanet astronomy and is relevant to astronomers and researchers investigating planetary formation and habitability.
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51 Pegasi b ranks #17 of 269 in the Exoplanet ranking, behind Beta Pictoris b, ahead of WASP-39b.
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Why is 51 Pegasi b historically significant in astronomy?
Discovered in 1995, 51 Pegasi b was the first confirmed exoplanet found orbiting a main-sequence, Sun-like star. Its discovery by Michel Mayor and Didier Queloz revolutionized astronomy and earned them a share of the 2019 Nobel Prize in Physics.
What type of planet is 51 Pegasi b?
It is classified as a "hot Jupiter," a massive gas giant that orbits extremely close to its host star. The planet completes a full orbit in just about four days, far closer than Mercury is to our Sun.
How did astronomers discover 51 Pegasi b?
The planet was discovered using the radial velocity method, often called the "wobble" method. Astronomers detected tiny, periodic shifts in the light spectrum of the star 51 Pegasi caused by the planet's massive gravitational pull.
How far away is the 51 Pegasi system from Earth?
The star 51 Pegasi and its famous planet are located approximately 50 light-years away from Earth in the constellation Pegasus. This relatively close proximity made it an excellent target for radial velocity observations.
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