HD 168443 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 168443</td></tr><tr> <td colspan="2">Constellation</td> <td>Serpens</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>18h 20m 03.9316s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>−09° 35′ 44.601″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>6.92</td></tr><tr><td colspan="2">Distance</td><td>123.5 ly
(37.88 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G5IV</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.29 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.14 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.44 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.529 ± 0.02</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>58.116 ± 0.001 d
(0.15911 y)</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>172.9°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,451,616.36 ± 0.02 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>475.9 ± 1.6 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>7.696 ± 0.015[1] MJ
(2300 M)</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>September 9, 1998</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Butler, Marcy et al.</td></tr><tr> <td colspan="2">Discovery method</td> <td>Doppler spectroscopy</td></tr><tr> <td colspan="2">Discovery site</td> <td>Hawaii, USA</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
</td><td>data</td></tr><tr><td colspan=2>SIMBAD</td><td>data</td></tr>

HD 168443 b is a planet seven times as massive as Jupiter. Given the high mass, this planet is likely to be a gas giant, or possibly a small brown dwarf depending on the orbital inclination. It orbits closer to its star than Mercury does to the Sun, and its surface temperature is likely to be very high.


  1. (2012). The Discovery of HD 37605c and a Dispositive Null Detection of Transits of HD 37605b. Astrophysical Journal.

External linksEdit

  • HD 168443. Exoplanets. Retrieved 2008-09-08.

Coordinates: Sky map 18h 20m 03.9316s, −09° 35′ 44.601″

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