Gliese 86 b

Planetbox begin
name = Gliese 86 bPlanetbox image


caption = An artist's impression of Gliese 86 b.Planetbox star
star = Gliese 86
constell = Eridanus
ra = RA|02|10|14
dec = DEC|-50|50|00
dist_ly = 35.9
dist_pc = 11
class = K1VPlanetbox orbit
semimajor = 0.113cite web|url=http://exoplanets.org/planets.shtml|title=Planets Table|work=Catalog of Nearby Exoplanets|year=2007|author=Butler, R. et al.|accessdate=2007-08-02]
period = 15.76491 ± 0.00039
eccentricity = 0.0416 ± 0.0072
ang_dist = 10
long_peri = 269 ± 16
t_peri = 2451903.36 ± 0.59
semi-amp = 376.7 ± 2.9Planetbox character
mass = >3.91Planetbox discovery
discovery_date = 24 November 1998
discovery_site = flag|France
discoverers = Mayor "et al." [Michel Mayor, Didier Queloz, Udry "et al."]
discovery_method = Doppler spectroscopy
discovery_status = PublishedPlanetbox catalog
names = Gl 86 (A)b, HD 13445 (A)b, HR 637 (A)b

Gliese 86 b, often cataloged Gliese 86 Ab (so as to distinguish the planet from companion star "B") and or shortened to Gl 86 b, is an extrasolar planet approximately 36 light-years away in the constellation of Eridanus. The planet was discovered orbiting a K-type dwarf star (Gliese 86) by French scientists in November 1998. The planet orbits very close to the star, completing an orbit in 15.77 days.

The preliminary astrometric measurements made with the Hipparcos space probe suggest the planet has an orbital inclination of 164.0° and a mass 15 times Jupiter, which would make the object a brown dwarf. [cite journal | url=http://www.journals.uchicago.edu/doi/full/10.1086/318927 | author=Han "et al." | title=Preliminary astrometric masses for proposed extrasolar planetary companions | journal=The Astrophysical Journal | volume=548| issue=1 | pages=L57 – L60 | year=2001 | doi=10.1086/318927 ] However, further analysis suggests the Hipparcos measurements are not precise enough to reliably determine astrometric orbits of substellar companions, thus the orbital inclination and true mass of the candidate planet remain unknown. [cite journal|url=http://adsabs.harvard.edu/abs/2001A%26A...372..935P|title=Screening the Hipparcos-based astrometric orbits of sub-stellar objects|author=Pourbaix, D. and Arenou, F.|journal=Astronomy and Astrophysics|volume=372|pages=935 – 944|year=2001|doi=10.1051/0004-6361:20010597]

The radial velocity measurements of Gliese 86 show a linear trend once the motion due to this planet are taken out. This may be associated with the orbital motion of the white dwarf companion star.

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