51 Pegasi

51 Pegasi is the name of the star around which Orbite the first Exoplanète (51 Peg b) to have been discovered. It is in the constellation of PEGASE.

History

The advertisement of the discovery was made October 6th 1995 by Michel Mayor and Didier Queloz (of the Observatoire of Geneva) in volume 378 of the scientific magazine Nature .

They discovered it after having studied several other stars with the spectrograph ELODIE on the Télescope of 1,93 meter of the Observatoire of High-Provence in France.

Characteristics

51 Pegasi

51 Pegasi is in the constellation of PEGASE, with approximately 48 light-years of the Earth. This star is regarded as a solar Jumeau though that a little older (7,5 billion years), 4 to 6% more massive and a higher metallicity.

51 Pegasi B

51 Peg B is a gas giantess orbiting with 0,05 UA of 51 Pegasi. Being very close, it carries out a complete revolution in 4 days.

The fact that it is so close has surprised the astrophysicists, because they did not expect to find a giantess gas also near to her star (one twentieth of the distance Ground-Sun). For this reason they added a new type of planet, the Jupiter heat S, because the temperature is of approximately 1.000°C.

It has a mass which at least is equal to half of that of Jupiter, that is to say 150 times that of the Earth.

References

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