| Discovery | |
|---|---|
| Discovered by | Bouchy et al. |
| Discovery site |  La Silla Observatory |
| Discovery date | June 16, 2008 |
| Doppler spectroscopy | |
| Orbital characteristics | |
| Apastron | 0.052 AU (7,800,000 km) |
| Periastron | 0.048 AU (7,200,000 km) |
| 0.050 AU (7,500,000 km) | |
| Eccentricity | 0.038 ± 0.02 |
| 4.0845 ± 0.0002 d | |
Average orbital speed | 130 |
| 2,454,562.77 ± 0.08 | |
| Star | HD 47186 |
HD 47186 b is a “hot Neptune” extrasolar planet located approximately 123 light years away in the constellation of Canis Major, orbiting the star HD 47186. This planet has a minimum mass of 22.78 times that of Earth and orbits very close to the star at a similar distance from the star as 51 Pegasi b is from 51 Pegasi. As in consequence, it takes 4.0845 days to complete an orbit with an eccentricity of 0.038, which is similar to the 5.66 year-period planet HD 70642 b.