HD 208487 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 208487</td></tr><tr> <td colspan="2">Constellation</td> <td>Grus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>21h 57m 19.8477s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>−37° 45′ 49.037″</td></tr><tr><td colspan="2">Distance</td><td>144.4 ly
(44.30 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>0.524 ± 0.030[1] AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.24 ± 0.16[1]</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>130.08 ± 0.51[1] d</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>113[1]°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,450,999 ± 15[1] JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>19.7 ± 3.6[1] m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>0.520 ± 0.082[1] MJ</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, Butler,
Marcy et al.[2]</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 United States</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
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

HD 208487 b is an extrasolar planet located approximately 144 light-years away in the constellation of Grus, orbiting the star HD 208487. This planet has a minimum mass close to half that of Jupiter and is most probably a gas giant. The planet orbits the star in a close, eccentric orbit. One revolution takes 130 days to complete. This planet was discovered on September 16, 2004 by Tinney, Butler, and Marcy et al. using Doppler spectroscopy to measure the star's radial velocity changing over time as the planet revolves around its orbit.[2]


  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 (2006). Catalog of Nearby Exoplanets. The Astrophysical Journal 646 (1): 505–522.
  2. 2.0 2.1 2.2 (2005). Three Low-Mass Planets from the Anglo-Australian Planet Search. The Astrophysical Journal 623 (2): 1171–1179.

External links Edit

  • HD 208487. Exoplanets. Retrieved 2008-08-29.

Coordinates: Sky map 21h 57m 19.8477s, −37° 45′ 49.037″

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