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HD 6434 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 6434</td></tr><tr> <td colspan="2">Constellation</td> <td>Phoenix</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>01h 04m 40.1511s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–39° 29′ 17.583″</td></tr><tr><td colspan="2">Distance</td><td>131.5 ly
(40.34 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G2/G3V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.14 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.12 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.16 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.17±0.03</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>21.998±0.009 d
(0.060226 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>69 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>156±11°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,451,490.8
±0.6 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>34.2±1.1 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>0.39 MJ
(>120 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>7 August 2000</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Queloz 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 and Carnegie
Planet Search
</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 6434 b is an extrasolar planet orbiting the star HD 6434. It has a minimum mass about half that of Jupiter. It orbits the star very close, over 2.5 times as close as Mercury orbits the Sun. For this reason it completes one orbit in only 22 days. Unlike true "hot Jupiters" like 51 Pegasi b, HD 6434 b does not have a circular orbit, but rather an eccentric one.[1]

By studying observations taken by the Hipparcos astrometric mission, a group of scientistsTemplate:Citation needed proposed that the planet has an inclination of 179.9° (almost exactly face-on) and a mass of 196 Jupiters. If that was the case, the planet would be a red dwarf instead. However, the data was anything but conclusive, and statistically it is extremely unlikely to lie in such a positionTemplate:Citation needed. But because the inclination is unknown, so is the true mass of the planet. Still, it is very probable that the object is a true planet.

See also Edit

ReferencesEdit

External links Edit

Coordinates: Sky map 01h 04m 40.1511s, −39° 29′ 17.583″


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