| Discovery | |
|---|---|
| Discovery date | 9 October 2011 |
| Doppler spectroscopy | |
| Orbital characteristics | |
| 1.9 AU (280,000,000 km) | |
| Eccentricity | 0.4 (± 0.1) |
| 745.7 (± 13.8) d | |
| 54,292 ± 28.3 | |
| 108.1 ± 21.8 | |
| Semi-amplitude | 91.5 ± 12.8 |
| Star | HD 240237 (BD+57° 2714) |
| Physical characteristics | |
| ~1.11 RJ | |
| Mass | 15.89±5.58 MJ[1] |
| Temperature | 781 K (508 °C; 946 °F) |
HD 240237 b is a super-Jupiter exoplanet orbiting the K-type giant star HD 240237 about 4,900 light-years (1,500 parsecs, or nearly 4.6×1016 km) away from Earth in the constellation Cassiopeia. It orbits outside of the habitable zone of its star at a distance of 1.9 AU. The exoplanet was found by using the radial velocity method, from radial-velocity measurements via observation of Doppler shifts in the spectrum of the planet's parent star. The planet has a mildly eccentric orbit.