HD 222237 b
HD 222237 b is a cold gas giant orbiting the K3 V star HD 222237 in the constellation Tucana. It lies about 37 light-years from Earth and was discovered in 2024 using the radial velocity method.
Is HD 222237 b in the Habitable Zone?
HD 222237 b orbits beyond the outer edge of the habitable zone of HD 222237. At that distance, any surface water would almost certainly be frozen.
Habitable zone of HD 222237: 0.380–0.929 AU (conservative: 0.482–0.881 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
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Orbit and Year Length
A year on HD 222237 b — one full orbit around HD 222237 — lasts 14,892.0 Earth days, longer than Jupiter's 12-year orbit. It orbits at an average distance of 10.800 AU. Its orbit is highly elliptical (eccentricity 0.56), swinging dramatically closer to and farther from its star.
How Was HD 222237 b Discovered?
HD 222237 b was discovered in 2024 using the radial velocity method, with observations from Multiple Observatories.
The radial velocity method measures the subtle wobble of a star caused by the gravitational pull of an orbiting planet, visible as periodic shifts in the star's light spectrum. The size of the wobble reveals the planet's minimum mass.
How Far Away Is HD 222237 b?
HD 222237 b is 37.3 light-years (11.4 parsecs) from Earth. Light arriving here tonight left the planet around the year 1989. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 656,480 years to make the journey.
The Host Star: HD 222237
HD 222237
- Spectral type
- K3 V
- Surface temperature
- 4,751 K (Sun: 5,772 K)
- Mass
- 0.76 M☉
- Radius
- 0.71 R☉
Planetary System
HD 222237 b is the only planet known to orbit HD 222237 so far.
HD 222237 b — Complete Data
| Mass | 1,649.53 Earth masses (5.190 Jupiter masses) |
|---|---|
| Orbital period | 14,892.00 days |
| Orbital distance | 10.800 AU |
| Eccentricity | 0.560 |
| Distance from Earth | 37.3 light-years (11.4 parsecs) |
| Constellation | Tucana |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2024 |
Data: NASA Exoplanet Archive, last updated 2024-09-28. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 222237 b
Is HD 222237 b habitable?
No — HD 222237 b orbits outside the habitable zone of HD 222237 and is likely too cold for liquid water on its surface.
How far away is HD 222237 b?
HD 222237 b is about 37 light-years from Earth in the constellation Tucana. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 656,480 years to get there.
How long is a year on HD 222237 b?
One orbit around HD 222237 takes 14,892.0 Earth days.
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