HD 108147 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 108147</td></tr><tr> <td colspan="2">Constellation</td> <td>Crux</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>12h 25m 46.2686s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–64° 01′ 19.516″</td></tr><tr><td colspan="2">Distance</td><td>125.7 ly
(38.57 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>F8/G0V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.104 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.052 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.156 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.498 ± 0.025</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>10.901 ± 0.001 d
(0.029845 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>104 km/s</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>318 ± 3.03°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,451,591.6 ± 0.1 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>25.1 ± 6.1 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>0.40 MJ
(127 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>April 15, 2000[1]</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Pepe, Mayor,
Galland et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy
(CORALIE)</td></tr><tr> <td colspan="2">Discovery site</td> <td>La Silla Observatory, Chile</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr> <tr style="background-color: #A0B0FF;"><td align=center colspan=3>Database references</td></tr><tr valign=baseline><td colspan=2>Extrasolar Planets
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

HD 108147 b is a gas giant exoplanet with a minimum mass about half that of Jupiter. It orbits the star in a very tight "torch orbit". The distance between the planet and the star is only a tenth of the distance between Earth and the Sun (0.1AU). A number of such worlds are known to exist, but the eccentricity of this planet is unusually high. Planets orbiting very close to their parent stars usually have round orbits because of the tidal forces between the bodies.

See alsoEdit


  1. Script error

External links Edit

Coordinates: Sky map 12h 25m 46.2686s, −64° 01′ 19.516″

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