HD 4308 b
Extrasolar planet List of extrasolar planets
Artist's conception of HD 4308 b, as a hot "super-Earth".
Parent star

<tr> <td colspan="2">Star</td> <td>HD 4308</td></tr><tr> <td colspan="2">Constellation</td> <td>Tucana</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>00h 44m 39.267s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–65° 38′ 58.28″[1]</td></tr><tr><td colspan="2">Distance</td><td>71.9 ± 0.5[1] ly
(22.1 ± 0.2[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G5V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.115 ± 0.096 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.115 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.115 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.00 ± 0.01</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>15.56 ± 0.02 d
(0.04260 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>80.7 km/s</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>359±47°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,453,314.70
±2.0 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>4.07 ± 0.2 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>0.0442 MJ
(>14 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>22 August 2005</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Udry et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler Spectroscopy</td></tr><tr> <td colspan="2">Discovery site</td> <td>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 4308 b is a low-mass exoplanet orbiting around HD 4308. Its believed to have almost no orbital eccentricity .[2]

See also Edit


  1. 1.0 1.1 1.2 1.3 (2007). Validation of the new Hipparcos reduction. Astronomy and Astrophysics 474 (2): 653–664. Vizier catalog entry
  2. (2006). The HARPS search for southern extra-solar planets V. A 14 Earth-masses planet orbiting HD 4308. Astronomy and Astrophysics 447 (1): 361–367.

External links Edit

Coordinates: Sky map 00h 44m 39.2677s, −65° 38′ 58.280″

de:HD 4308 b

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