description Upsilon Andromedae b Overview
Upsilon Andromedae b is a hot Jupiter exoplanet discovered in 1996 orbiting the F-type main-sequence star Upsilon Andromedae A, located approximately 44 light-years from Earth. It was the first planet detected in this system, which subsequently became the first confirmed multi-planet system discovered around a sun-like star. With an orbital period of roughly 4.6 days, the planet orbits very close to its host star at a distance of about 0.06 astronomical units. It has a minimum mass of approximately 0.69 times that of Jupiter.
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What kind of planet is Upsilon Andromedae b?
Upsilon Andromedae b is a hot Jupiter, meaning it is a gas giant orbiting very close to its star. It completes an orbit in roughly 4.6 days.
How was Upsilon Andromedae b discovered?
Astronomers discovered it in 1996 by measuring the star's radial-velocity wobble caused by the planet's gravity. This was different from the transit method used by NASA's Kepler telescope.
Why is the Upsilon Andromedae system historically important?
Upsilon Andromedae b was the first planet detected around its F-type host star, which is about 44 light-years away. The system later became the first confirmed multi-planet system found around a main-sequence star.
Is Upsilon Andromedae b similar to 51 Pegasi b?
Both are famous hot Jupiters discovered around ordinary Sun-like stars, and both orbit very close to their hosts. Upsilon Andromedae b circles its star in about 4.6 days.
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