HD 30177 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 30177</td></tr><tr> <td colspan="2">Constellation</td> <td>Dorado</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>04h 41m 54.3731s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>–58° 01′ 14.725″</td></tr><tr> <td>Apparent magnitude</td> <td style="text-align: center">(mV)</td> <td>8.41</td></tr><tr><td colspan="2">Distance</td><td>178.4 ly
(54.7 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>G8V</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>3.95 ± 0.05 AU
(591 Gm)</td></tr><tr><td> </td> <td style="text-align: center"> </td> <td>72.2 mas</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>3.19 AU
(477 Gm)</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>4.71 AU
(705 Gm)</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.193 ± 0.025</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>2770 ± 100 d
(7.58 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>15.6 km/s</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>34 ± 15°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2451437 ± 72 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>146.8 ± 2.8 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>10.52 ± 0.20 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>June 13, 2002</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Tinney, Butler, 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>Anglo-Australian Planet Search</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

HD 30177 b is an extrasolar planet located approximately 178 light-years away in the constellation of Dorado, orbiting the star HD 30177. This is one of the most massive planets ever detected by the radial velocity method. In addition, the planet orbits far from the star, about 4 AU away, taking 2770 days (7.58 years) to orbit the star. Even though the massive planet is orbiting at 4 AU from the star, the radial velocity semi-amplitude is high, around 146.8±2.8 m/s. Since the inclination (and thus the true mass) is not known, this planet candidate may in fact be a brown dwarf.

This planet was discovered on June 13, 2002 by Tinney, Butler, and Marcy et al. using the Doppler spectroscopy from the Anglo-Australian Telescope.[1][2]

See alsoEdit


  1. (2003). Four New Planets Orbiting Metal-enriched Stars. The Astrophysical Journal 587 (1): 423–428.
  2. (2006). Catalog of Nearby Exoplanets. The Astrophysical Journal 646 (1): 505–522.

External linksEdit

Coordinates: Sky map 04h 41m 54.3731s, −58° 01′ 14.725″

de:HD 30177 b

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