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HD 212771 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 212771</td></tr><tr> <td colspan="2">Constellation</td> <td>Aquarius</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>22h 27m 03s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>−17° 15′ 49″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>7.6</td></tr><tr><td colspan="2">Distance</td><td>427 ± 46 ly
(131 ± 14 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G8IV</td></tr><tr> <td>Mass</td> <td style="text-align: center">(m)</td> <td>1.15 ± 0.08 M</td></tr><tr> <td>Radius</td> <td style="text-align: center">(r)</td> <td>5 ± 0.1 R</td></tr><tr> <td>Temperature</td> <td style="text-align: center">(T)</td> <td>5121 ± 44 K</td></tr><tr> <td>Metallicity</td> <td style="text-align: center">[Fe/H]</td> <td>-0.21 ± 0.03</td></tr><tr> <td>Age</td> <td style="text-align: center"></td> <td>6 ± 2 Gyr</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.22 ± 0.3 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.111 ± 0.06</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>373.3 ± 3.4 d</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>2.3 ± .4 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>2010-03-17</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Howard et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy</td></tr><tr> <td colspan="2">Discovery status</td> <td></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 212771 b is an extrasolar planet orbiting the G-type star HD 212771 approximately 427 light years away in the constellation Aquarius.[1]

See alsoEdit

ReferencesEdit

External linksEdit

Coordinates: Sky map 22h 27m 03s, −17° 15′ 49″


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