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HD 99109 b
Extrasolar planet List of extrasolar planets
300px
Artist's conception of HD 99109 b, as a gas giant.
Parent star

<tr> <td colspan="2">Star</td> <td>HD 99109</td></tr><tr> <td colspan="2">Constellation</td> <td>Leo</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>11h 24m 17.359s[1]</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–01° 31′ 44.66″[1]</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>9.1</td></tr><tr><td colspan="2">Distance</td><td>160 ± 10[1] ly
(50 ± 3[1] pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K0V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>1.105 ± 0.065 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.09 ± 0.16</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>439.3 ± 5.6 d</td></tr><tr> <td>Argument of
periastron
</td> <td style="text-align: center">(ω)</td> <td>256°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,411,310 ± 80 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>14.1 ± 2.2 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>0.502 ± 0.07 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>15 July 2006</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Butler et al.[2]</td></tr><tr> <td colspan="2">Discovery method</td> <td>Radial velocity</td></tr><tr> <td colspan="2">Discovery site</td> <td>Template:Country data United States</td></tr><tr> <td colspan="2">Discovery status</td> <td>Confirmed</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 99109 b is an extrasolar planet approximately 197 light-years away in the constellation of Leo. The planet was confirmed in 2006 to be orbiting the orange dwarf star HD 99109. The planet is about one half the mass of Jupiter, classifying the planet as a Jovian planet. The orbital eccentricity is about the same as Mars.[2]

External links Edit

  • HD 99109. Exoplanets. Retrieved 2008-07-18.
  • HD 99109 b. PlanetQuest. Retrieved 2008-07-18.


Coordinates: Sky map 11h 24m 17.358s, −01° 31′ 44.674″


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