Gliese 86 b
Extrasolar planet List of extrasolar planets
An artist's impression of Gliese 86 b.
Parent star

<tr> <td colspan="2">Star</td> <td>Gliese 86</td></tr><tr> <td colspan="2">Constellation</td> <td>Eridanus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>02h 10m 14s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>−50° 50′ 00″</td></tr><tr><td colspan="2">Distance</td><td>35.9 ly
(11 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K1V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.113[1] AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.0416 ± 0.0072[1]</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>15.76491 ± 0.00039[1] d</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>269 ± 16[1]°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2451903.36 ± 0.59[1] JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>376.7 ± 2.9[1] m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>3.91[1] MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>24 November 1998[2]</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Mayor et al.[3]</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy</td></tr><tr> <td colspan="2">Discovery site</td> <td>Template:Country data France</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

Other designations
Gl 86 (A)b, HD 13445 (A)b

Gliese 86 b, sometimes referred to as Gliese 86 AbTemplate:Citation needed (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.[2] The planet orbits very close to the star, completing an orbit in 15.78 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.[4] 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.[5]

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.

References Edit

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Butler, R. et al. (2007). Planets Table. Catalog of Nearby Exoplanets. Retrieved 2007-08-02.
  2. 2.0 2.1 Script error
  3. Michel Mayor, Didier Queloz, Udry et al.
  4. Han et al. (2001). Preliminary astrometric masses for proposed extrasolar planetary companions. The Astrophysical Journal Letters 548 (1): L57–L60.
  5. Pourbaix, D. and Arenou, F. (2001). Screening the Hipparcos-based astrometric orbits of sub-stellar objects. Astronomy and Astrophysics 372 (3): 935–944.

External links Edit

Coordinates: Sky map 02h 10m 14s, −50° 50′ 00″ Template:Nearest bright star systems

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