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HD 122430 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 122430</td></tr><tr> <td colspan="2">Constellation</td> <td>Hydra</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>14h 02m 22.7815s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>−27° 25′ 47.183″</td></tr><tr><td colspan="2">Distance</td><td>440 ly
(135 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K3III</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.02 AU
(153 Gm)</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.33 AU
(49 Gm)</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>1.71 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.68±0.09</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>344.95±1.08 d
(0.94441 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>32.3 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>91.04±17.27°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2451986.71±3.75 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>2.02 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>3.71 MJ
(1180 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>April 14, 2003</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Setiawan et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>Spain</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
Encyclopaedia
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

HD 122430 b is a giant planet orbiting around the giant star HD 122430. It has a mass at least 3.71 times that of Jupiter. This planet located at a distance of 1.02 astronomical units away from its star, which is very similar to the Earth’s distance from the Sun. Despite of this, the higher luminosity of the star implies it is heated much more strongly than the Earth is. Its orbit is highly eccentric, around 68%. At periastron, the orbital distance from its parent star is 0.33 AU. At apastron, the distance is 1.71 AU. If this planet were in our own solar system, its orbit would range from just within Mercury’s orbit to just beyond Mars’s orbit.

In Spain, Setiawan discovered this planet in 2003, using the radial velocity method.

See alsoEdit

ReferencesEdit

  • Setiawan, J. (2003). Planets around evolved stars. ARI: 595–598.

External links Edit

Coordinates: Sky map 14h 02m 22.7815s, −27° 25′ 47.183″


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