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HD 219828 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 219828</td></tr><tr> <td colspan="2">Constellation</td> <td>Pegasus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>23h 18m 46.7353s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+18° 38′ 44.590″</td></tr><tr><td colspan="2">Distance</td><td>264.5 ly
(81.1 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>0.052 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.051 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.053 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.021</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>3.8335 ± 0.0013 d</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>0°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,453,898.6289 ± 0.072 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>7 ± 50 m/s</td></tr>

Physical characteristics

<tr><td>Mass</td><td style="text-align: center">(m)</td><td>>0.066 MJ
(>21 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>Feb 18, 2007</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Melo et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>23x15px Chile</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

HD 219828 b is an extrasolar planet approximately 265 light years away in the constellation of Pegasus. This is a Neptune-mass planet at least 21 times more massive than Earth. The planet's composition is unknown, but it may be similar to the ice giants Uranus and Neptune, or alternatively it may be a mainly rocky like Super-Earth.

External links Edit

Coordinates: Sky map 23h 18m 46.7353s, +18° 38′ 44.590″


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