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HD 185269 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 185269</td></tr><tr> <td colspan="2">Constellation</td> <td>Cygnus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>19h 37m 11.7408s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+28° 29′ 59.509″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>6.67</td></tr><tr><td colspan="2">Distance</td><td>153.3 ± 3.3 ly
(47 ± 1 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G0IV</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.077 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.054 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.100 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.3 ± 0.04</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>6.838 ± 0.001 d</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>119 km/s</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>173 ± 6.8°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,453,154.1 ± 0.18 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>86 ± 4.4 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>0.94 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>August 18, 2006</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Moutou and Johnson et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>Observatoire de Haute Provence,
Lick Observatory</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 185269 b is a hot Jupiter extrasolar planet approximately 153 light years away in the constellation of Cygnus. The minimum mass is slightly less than Jupiter and the orbital period is about one week. Most hot Jupiters are thought to have undergone tidal circularization, making the eccentricity of HD 185269 b (e=0.3) unusual. Despite having a large transit probability, none have yet been detected by various photometric monitoring campaigns.

The planet was discovered nearly simultaneously by Johnson et al. as part of a search for planets around subgiants, and by Moutou et al. as part of a search for planets around metal-rich stars (the submission dates to the journals ApJ and Astronomy and Astrophysics were separated by only 9 days).

External linksEdit

Coordinates: Sky map 19h 37m 11.7408s, +28° 29′ 59.509″


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