| HD 240210 b | |
| Discoverer: | Niedzielski et al. |
| Discovery Site: | La Silla Observatory |
| Discovered: | June 10, 2009 |
| Apsis: | astron |
| Aphelion: | 1.53AU |
| Perihelion: | 1.13AU |
| Semimajor: | 1.33AU |
| Eccentricity: | 0.15 ± 0.02 |
| Period: | 501.75 ± 2.33 d 1.3737 ± 0.0064 y |
| Time Periastron: | 54486.73 ± 10.93 |
| Arg Peri: | 277.49 ± 7.77 |
HD 240210 b is a 6.9 Jupiter-mass exoplanet discovered on June 10, 2009 by Niedzielski et al. using the Hobby-Eberly Telescope. It orbits the K3 giant star HD 240210 in the constellation of Cassiopeia. Its average orbital separation is at 1.33 Astronomical Units away from its star with a year of 501.75 days.