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HD 117618 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 117618</td></tr><tr> <td colspan="2">Constellation</td> <td>Centaurus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>13h 32m 25.56s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–47° 16′ 16.91″</td></tr><tr><td colspan="2">Distance</td><td>124.0 ly
(38.02 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G2V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.176 ± 0.010 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.102 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.250 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.42 ± 0.17</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>25.827 ± 0.019 d
(0.070709 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>74.4 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>254 ± 19°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,450,832.2 ± 1.8 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>12.8 ± 2.2 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>0.178 ± 0.021 MJ
(>56.5 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>16 September 2004</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>C.G. Tinney, Butler,
Marcy et al.[1]</td></tr><tr> <td colspan="2">Discovery method</td> <td>Radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>Anglo-Australian Observatory</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published[1]</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 117618 b is an exoplanet discovered orbiting the star in September 2004. The planet is a small gas giant less than a fifth the mass of Jupiter. It orbits close to its star in a very eccentric orbit.[2][1]

ReferencesEdit

  1. 1.0 1.1 1.2 (2005). Three Low-Mass Planets from the Anglo-Australian Planet Search. The Astrophysical Journal 623 (2): 1171–1179.
  2. (2006). Catalog of Nearby Exoplanets. The Astrophysical Journal 646 (1): 505–522.

External links Edit

Coordinates: Sky map 13h 32m 25.56s, −47° 16′ 16.91″


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