HD 46375 b
Extrasolar planet List of extrasolar planets
Parent star

<tr> <td colspan="2">Star</td> <td>HD 46375</td></tr><tr> <td colspan="2">Constellation</td> <td>Monoceros</td></tr><tr> <td>Right ascension</td> <td style="text-align: center">(α)</td> <td>06h 33m 12.6237s</td></tr><tr> <td>Declination</td> <td style="text-align: center">(δ)</td> <td>+05° 27′ 46.532″</td></tr><tr><td colspan="2">Distance</td><td>108.9 ly
(33.41 pc)</td></tr><tr><td colspan="2">Spectral type</td> <td>K1IV</td></tr>

Orbital elements

<tr><td>Semimajor axis</td><td style="text-align: center">(a)</td> <td>0.0398±0.0023 AU</td></tr><tr> <td>Periastron</td> <td style="text-align: center">(q)</td> <td>0.0373 AU</td></tr><tr> <td>Apastron</td> <td style="text-align: center">(Q)</td> <td>0.0423 AU</td></tr><tr> <td>Eccentricity</td> <td style="text-align: center">(e)</td> <td>0.063±0.026</td></tr><tr><td>Orbital period</td><td style="text-align: center">(P)</td> <td>3.023573±0.000065 d
(0.008277947 y)</td></tr><tr> <td>Orbital speed</td> <td style="text-align: center">(υ)</td> <td>144 km/s</td></tr><tr> <td>Argument of
</td> <td style="text-align: center">(ω)</td> <td>114±24°</td></tr><tr> <td>Time of periastron</td> <td style="text-align: center">(T0)</td> <td>2,451,071.53±0.19 JD</td></tr><tr> <td>Semi-amplitude</td> <td style="text-align: center">(K)</td> <td>33.65±0.74 m/s</td></tr>

Physical characteristics

<tr><td>Minimum mass</td><td style="text-align: center">(m sin i)</td><td>0.226±0.019 MJ</td></tr>

Discovery information

<tr> <td colspan="2">Discovery date</td> <td>March 29, 2000</td></tr><tr> <td colspan="2">Discoverer(s)</td> <td>Marcy, Butler,
Vogt 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 California, USA</td></tr><tr> <td colspan="2">Discovery status</td> <td>Published</td></tr>

HD 46375 b is an extrasolar planet located approximately 109 light-years away in the constellation of Monoceros, orbiting the star HD 46375. With 79 Ceti b on March 29, 2000, it was joint first known extrasolar planet less massive than Saturn orbiting a normal star. The planet is a "hot Jupiter", a type of planet that orbits very close to its parent star. In this case the orbital distance is only a tenth that of the planet Mercury. No transit of the planet has been detected, so its inclination must be less than 83°. Because the inclination is unknown, the true mass of the planet is not known.[1]


  1. (2000). Sub-Saturn Planetary Candidates of HD 16141 and HD 46375. The Astrophysical Journal Letters 536 (1): L43–L46.

External linksEdit

Coordinates: Sky map 06h 33m 12.6237s, +05° 27′ 46.532″

de:HD 46375 b

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