| HD 2638 b | |
| Discoverer: | Moutou, Mayor, Bouchy et al. |
| Discovery Site: | Geneva |
| Discovered: | 2005 |
| Discovery Method: | Radial velocity |
| Apsis: | astron |
| Semimajor: | 0.044AU |
| Eccentricity: | 0 |
| Period: | 3.4442 ± 0.0002 d |
| Time Periastron: | 2,453,323.206 ± 0.002 |
| Arg Peri: | 0 |
| Semi-Amplitude: | 67.4 ± 0.4 |
| Star: | HD 2638 |
| Mass: | >0.48 |
HD 2638 b is a planet of the star HD 2638. It is a typical "hot Jupiter", a planet that orbits its parent star in a very tight "torch orbit". The distance to the star is less than 1/20 Earth's distance from the Sun. One orbital revolution lasts only about three and half days.