HD 102117 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 102117</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>11h 44m 50.4616s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–58° 42′ 13.354″</td></tr><tr><td colspan="2">Distance</td><td>137 ly
(42 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G6V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.1532 ± 0.0088 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.1347 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.1717 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.106 ± 0.07</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>20.8133 ± 0.0064 d</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>80.35 km/s</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>283 ± 3°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>10942.9 ± 3 2.400.000 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>11.8 ± 0.77 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>0.172 ± 0.018 MJ
(>54.7 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>September 16, 2004</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Tinney 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, Australia</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
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

HD 102117 b is a planet that orbits the star HD 102117. The planet is a small gas giant a fifth the size of Jupiter. It orbits very close to its star, but not in a "torch orbit" like the famous 51 Pegasi b. It is one of the smallest extrasolar planets discovered so far.[2]

In 2004, the Anglo-Australian Planet Search announced a planet orbiting the star HD 102117.[1] A short time later the HARPS team also announced the presence of a planet around this same star HD 102117. Both groups detected this planet using the radial velocity method.[3]


  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.
  3. (2005). The HARPS search for southern extra-solar planets III. Three Saturn-mass planets around HD 93083, HD 101930 and HD 102117. Astronomy and Astrophysics 437 (3): 1121–1126.

External links Edit

Coordinates: Sky map 11h 44m 50.4616s, −58° 42′ 13.354″

de:HD 102117 b

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