HD 89307 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 89307</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>10h 18m 21.2877s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+12° 37′ 15.990″</td></tr><tr><td colspan="2">Distance</td><td>108 ly
(33 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G0V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>3.28 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>2.54 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>4.02 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.23 ± 0.18</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>2159 ± 70 d
(5.911 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>16.6 km/s</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>10.5°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,452,370 ± 250 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>31.0 ± 4.9 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>1.92 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>December 26, 2004</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Marcy et al.?</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>Published[1]</td></tr>

HD 89307 b is an extrasolar planet orbiting the star HD 89307 located approximately 108 light-years away in the constellation of Leo. The planet takes 187 megaseconds to orbit (roughly 2164 days or 5.9 years). The planet’s minimum mass is 1.92 MJ since the inclination is unknown. As it is typical for most of the long-period planets, the eccentricity is greater than any planets in our solar system, orbiting at the average distance of 491 gigameters. The speed of the wobble caused by the planet’s gravity is 31 meters per second. The average orbital velocity is 16.6 m/s.


  1. (2009). Five planets and an independent confirmation of HD 196885 Ab from Lick Observatory. The Astrophysical Journal 703 (2): 1545–1556.

External linksEdit

Coordinates: Sky map 10h 18m 21.2877s, +12° 37′ 15.990″

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