HD 128311 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 128311</td></tr><tr> <td colspan="2">Constellation</td> <td>Boötes</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>14h 36m 00.5607s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+09° 44′ 47.466″</td></tr><tr><td colspan="2">Distance</td><td>54.14 ly
(18.04 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K0V</td></tr><tr> <td>Mass</td> <td style="text-align: center">(m)</td> <td>0.8 M</td></tr><tr> <td>Radius</td> <td style="text-align: center">(r)</td> <td>0.73 R</td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>4965 K</td></tr><tr> <td>Metallicity</td> <td style="text-align: center">[Fe/H]</td> <td>0.03</td></tr><tr> <td>Age</td> <td style="text-align: center"></td> <td>0.39 Gyr</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.76 ± 0.11 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>1.46 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>2.06 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.170 ± 0.090</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>928 ± 18 d
(2.54 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>20.7 km/s</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>200° ± 150°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,450,010 ± 400 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>76.2 ± 4.6 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>3.22 ± 0.49 MJ
(1020 ± 160 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>June 24, 2005</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Vogt et al.</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 USA California, USA</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 128311 c is an exoplanet located approximately 54 light-years away in the constellation of Boötes. This planet orbits in an eccentric orbit at 1.76 AU from its star (HD 128311). The planet has minimum mass 3.22 Jupiter masses.[1]


  1. (2005). Five New Multicomponent Planetary Systems. The Astrophysical Journal 632 (1): 638–658.

External linksEdit

Template:HD 128311 Coordinates: Sky map 14h 36m 00.5607s, +09° 44′ 47.466″ Template:Star systems within 50 – 55 light-years

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