.jpg) The exoplanet Gliese 86 Ab (min mass ~4 MJ) rendered by Celestia | |
| Discovery | |
|---|---|
| Discovered by | Mayoret al.[1] |
| Discovery site |  France |
| Discovery date | 24 November 1998[2] |
| Doppler spectroscopy | |
| Orbital characteristics | |
| 0.1177+0.0015 −0.0012 AU[3] | |
| Eccentricity | 0.0478±0.0024[3] |
| 15.76491 ± 0.00039[4]d | |
| 2451903.36 ± 0.59[4] | |
| 269 ± 16[4] | |
| Semi-amplitude | 376.7 ± 2.9[4] |
| Star | Gliese 86 |
| Physical characteristics | |
| Mass | ≥4.266+0.11 −0.087 MJ[3] |
Gliese 86 b, sometimes referred to asGliese 86 A b[3] (so as to distinguish the planet from companion star "B") and/or shortened toGl 86 b, is anextrasolar planet approximately 35light-years away in theconstellation ofEridanus. The planet was discovered orbiting aK-type main-sequence star (Gliese 86 A) byFrench scientists in November 1998.[2] The planet orbits very close to the star, completing an orbit in 15.78days.
Preliminaryastrometric measurements made with theHipparcos space probe suggested the planet has an orbitalinclination of 164.0° and amass 15 times that ofJupiter, which would make the object abrown dwarf.[5] However, further analysis suggests the Hipparcos measurements are not precise enough to reliably determine astrometric orbits of substellar companions, thus the orbital inclination andtrue mass of the candidate planet remain unknown.[6]
