HD 240210 b

{{short description|Jupiter-like exoplanet orbiting the star HD 240210}}

{{Infobox planet

| name = HD 240210 b

| discoverer = Niedzielski et al.

| discovery_site = La Silla Observatory

| discovered = June 10, 2009

| discovery_method = radial velocity

| apsis = astron

| aphelion = {{convert|1.53|AU|km|abbr=on}}

| perihelion = {{convert|1.13|AU|km|abbr=on}}

| semimajor = {{convert|1.33|AU|km|abbr=on}}

| 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

| star = HD 240210

}}

HD 240210 b is a 6.9 Jupiter-mass exoplanet discovered on June 10, 2009 by Niedzielski Etal. 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.