HD 46375 b
| Discovery | |
|---|---|
| Discovered by | California and Carnegie Planet Search |
| Discovery site | W. M. Keck Observatory |
| Discovery date | March 29, 2000 |
| Doppler spectroscopy | |
| Orbital characteristics | |
| Apastron | 0.0423 AU (6,330,000 km) |
| Periastron | 0.0373 AU (5,580,000 km) |
| 0.0398 ± 0.0023 AU (5,950,000 ± 340,000 km) | |
| Eccentricity | 0.063±0.026 |
| 3.023573±0.000065 d 0.008277947 y | |
Average orbital speed | 144 |
| 2,451,071.53±0.19 | |
| 114±24 | |
| Semi-amplitude | 33.65±0.74 |
| Star | HD 46375 |
| Physical characteristics | |
| 1.02 RJ | |
| Mass | >0.23 MJ |
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.