| HD 46375 b | |
| Discoverer: | California and Carnegie Planet Search |
| Discovery Site: | W. M. Keck Observatory |
| Discovered: | March 29, 2000 |
| Apsis: | astron |
| Aphelion: | 0.0423AU |
| Perihelion: | 0.0373AU |
| Semimajor: | 0.0398± |
| Eccentricity: | 0.063±0.026 |
| Period: | 3.023573±0.000065 d 0.008277947 y |
| Avg Speed: | 144 |
| Time Periastron: | 2,451,071.53±0.19 |
| Arg Peri: | 114±24 |
| Semi-Amplitude: | 33.65±0.74 |
| Mean Radius: | [1] |
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.