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18 Delphini b
Exoplanet List of exoplanets
Parent star

<tr> <td colspan="2">Star</td> <td>18 Delphini</td></tr><tr> <td colspan="2">Constellation</td> <td>Delphinus</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>20h 58m 26s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>{{#invoke:String|replace|source=+10|-|−|1}}° 50′ 21″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>5.52</td></tr><tr><td colspan="2">Distance</td><td>238 ± 11 ly
(73.1 ± 3.5 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G6III</td></tr>

Orbital elements

<tr><td>Semi-major axis</td><td style="text-align: center">(a)</td> <td>2.6 AU
(390 Gm)</td></tr><tr><td> </td> <td style="text-align: center"> </td> <td>35 mas</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>2.4 AU
(360 Gm)</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>2.8 AU
(420 Gm)</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.08 ± 0.01</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>993.3 ± 3.2 d
(2.719 y)</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>166.1 ± 6.5°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2451672 ± 18 JD</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>10.3 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>19 February 2008</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Sato et al.<ref name="Sato2008"/></td></tr><tr> <td colspan="2">Discovery method</td> <td>radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>Okayama Planet
Search Program

</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published<ref name="Sato2008"/></td></tr>

Other designations
HD 199665 b, HIP 103527 b, HR 8030 b

<tr style="background-color: #A0B0FF;"><td style="text-align:center;" colspan=3>Database references</td></tr><tr style="vertical-align:baseline;"><td colspan=2>Extrasolar Planets
Encyclopaedia
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr><tr><td colspan=2>Exoplanet Archive</td><td>data</td></tr><tr><td colspan=2>Open Exoplanet Catalogue</td><td>data</td></tr>

18 Delphini b or 18 Del b is a very massive and dense planet approximately 238 light-years away in the constellation of Delphinus. The planet orbits the yellow giant star 18 Delphini. The planet has a minimum mass of 10.3 MJ and a period of 993 days. This planet was discovered on February 19, 2008 by Sato.<ref name="Sato2008"/>

The planet and its host star is one of the planetary systems selected by the International Astronomical Union as part of their public process for giving proper names to exoplanets and their host star (where no proper name already exists).<ref>NameExoWorlds: An IAU Worldwide Contest to Name Exoplanets and their Host Stars. IAU.org. 9 July 2014</ref><ref>NameExoWorlds.</ref> The process involves public nomination and voting for the new names, and the IAU plans to announce the new names in mid-November 2015.<ref>NameExoWorlds.</ref>



18 Delphini b sections
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