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NGC 2423-3 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>NGC 2423-3</td></tr><tr> <td colspan="2">Constellation</td> <td>Puppis</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>07h 37m 09s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>−13° 54′ 24″</td></tr><tr><td colspan="2">Distance</td><td>2498 ly
(766 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K-M III</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>2.1 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>1.66 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>2.54 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.21 ± 0.07</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>714.3 ± 5.3 d</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>18 ± 10°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,453,213 ± 21 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>71.5 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>10.6 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>21 June 2007</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Mayor 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 France</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

NGC 2423-3b is an extrasolar planet[1] approximately 2498 light-years away in the constellation of Puppis. The planet was announced in 2007 to be orbiting the red giant star NGC 2423-3 (which in turn is part of the NGC 2423 open cluster). The planet has a mass at least 10.6 times that of Jupiter. Only the minimum mass is known since the orbital inclination is not known, so it may instead be a brown dwarf.

This planet was discovered by Chad Lovis and Michel Mayor in June 2007. Lovis had also found three Neptune-mass planets orbiting HD 69830 in May 2006, also in Puppis.

References Edit

  1. C. Lovis and M. Mayor (2007). Two substellar companions in the open clusters NGC 2423 and NGC 4349. Astronomy & Astrophysics 472: 657–664.

External links Edit

See also Edit

Coordinates: Sky map 07h 37m 09s, −13° 54′ 24″


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