Gliese 777

Gliese 777 ( Gl 777 ) is a binary star of the Constellation of the Cygne. Most important, Gliese 777 has, is under yellow Géante and the second, Gliese 777 B, is a Naine red. Gliese 777 has is visible with the naked eye since the Ground under good conditions and one knows since 2005 qu ' it has two Planet S.

Gliese 777 has

Gliese 777 has is a star similar to the Sun which is stopping the nuclear Fusion of the Hydrogène. It is much older than the Sun (6,7 billion years), 4% less massive and 70% richer in “metals” (i.e. elements heavier than the Hélium, the last point being typical stars having of planets up to now discovered.

Planets of Gliese 777 has

Gliese 777 ac

Located at 0,128 UA of its star Gliese 777 ac is one of smallest the Exoplanète S discovered, with a mass minimum of 18 times that of the Earth, which would make a “hot Neptune of it”, or a telluric Planet giant.

Gliese 777 Ab

Gliese 777 Ab discovered in 2002, is at least a third more massive than Jupiter, at a comparable distance from its star but with a much larger orbital Excentricité.

Gliese 777 B

Gliese 777 B is dwarf a red in orbit with 3000 UA of Gliese 777 A. This star could it even be binary with another very small dwarf red.

See too

51 Pegasi
Gliese 229

References

http://www.edpsciences.org/articles/aa/abs/2004/40/aa0390-04/aa0390-04.html, NR. Asghari and Al, Stability off terrestrial planets in the livable zone off Gl 777 has, HD 72659, Gl 614,47 Uma and HD 4208|, Astronomy & Astrophysics, volume=426, 2004, p353-365.
http://xxx.lanl.gov/abs/astro-ph/0306586 Naef and Al, The ELODIE survey for northern extra-solar planets II. In Jovian planet there is length-period orbit around GJ 777 has, Astronomy and Astrophysics, volume 410,2003, pages 1051-1054.
http://www.journals.uchicago.edu/ApJ/journal/issues/ApJ/v632n1/62043/brief/62043.abstract.html, Vogt and Al, 2005, Five New Multicomponent Planetary Systems, Astrophysical Newspaper, volume 632, pages 638-658.

External bonds

'''Extrasolar Planets Encyclopaedia''': HD 190360
''' Extrasolar Visions ''': Gliese 777 has + Gliese 777 ac + Gliese 777 Ab

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