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HD 20868 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 20868</td></tr><tr> <td colspan="2">Constellation</td> <td>Fornax</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>03h 20m 42.69s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>−33° 43′ 48.4″[1]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>9.92</td></tr><tr><td colspan="2">Distance</td><td>151 ± 10[1] ly
(46 ± 3[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K3/4IV</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.947 ± 0.012 AU
(142 ± 1.8 Gm)</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.237 AU
(35.5 Gm)</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>1.66 AU
(248 Gm)</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.75 ± 0.002</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>380.85 ± 0.09 d
(1.0427 ± 0.0002 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>27.1 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>356.2 ± 0.4°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,454,451.52 ± 0.1 JD</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>1.99 ± 0.05 MJ
(632 ± 16 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>October 26, 2008</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Moutou et al.[2]</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy
(HARPS)</td></tr><tr> <td colspan="2">Discovery site</td> <td>La Silla Observatory</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published[2]</td></tr> <tr style="background-color: #A0B0FF;"><td align=center colspan=3>Database references</td></tr><tr valign=baseline><td colspan=2>Extrasolar Planets
Encyclopaedia
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

HD 20868 b is an extrasolar planet located approximately 159 light-years away in the constellation of Fornax, orbiting the 10th magnitude K-type subgiant star HD 20868. This planet has a minimum mass of 1.99 times more than Jupiter and orbits at a distance of 0.947 AU. This planet takes 380.85 days or 12.5 months to revolve around the star with an eccentricity of 0.75, one of the most eccentric of any known extrasolar planets. At periastron, the distance is 0.237 AU and at apastron, the distance is 1.66 AU.

This planet was discovered on October 26, 2008 by Moutou et al. using the HARPS spectrograph on ESO’s 3.6 meter telescope installed at La Silla Observatory in Atacama desert, Chile.[2]

See also Edit

References Edit

External links Edit

Coordinates: Sky map 03h 20m 42.6943s, −33° 43′ 48.374″


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