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HD 90156 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 90156</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>10h 23m 55.275s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–29° 38′ 43.91″[1]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>6.947</td></tr><tr><td colspan="2">Distance</td><td>72.9 ± 0.8[1] ly
(22.4 ± 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>0.264 AU
(39.4 Gm)</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.31 ± 0.10</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>49.8 d
(0.136 y)</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>0.055 MJ
(17.6 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>October 19, 2009</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Mordasini et al.[2]</td></tr><tr> <td colspan="2">Discovery method</td> <td>radial velocity (HARPS)</td></tr><tr> <td colspan="2">Discovery site</td> <td>La Silla Observatory</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published[2]</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 90156 b is an extrasolar planet which orbits the G-type main sequence star HD 90156, located approximately 73 light years away[1] in the constellation Hydra. This planet has at least 17.6 times the mass of Earth and takes over seven weeks to orbit the star at a semimajor axis of 0.264 AU. Its eccentricity is 0.31 ± 0.10, while the inclination is not known, as typical for the radial velocity detection method. This planet was announced by the Swiss-led HARPS team on October 19, 2009, together with 29 other planets.

References Edit


Coordinates: Sky map 10h 23m 55.2749s, −29° 38′ 43.905″


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