HD 22532 b
HD 22532 b is a cold gas giant orbiting the G8 III/IV star HD 22532 in the constellation Horologium. It lies about 526 light-years from Earth and was discovered in 2022 using the radial velocity method.
Is HD 22532 b in the Habitable Zone?
HD 22532 b orbits inside the inner edge of the habitable zone of HD 22532. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 22532: 3.390–8.184 AU (conservative: 4.294–7.759 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 22532 b — one full orbit around HD 22532 — lasts 872.6 Earth days, longer than an Earth year. It orbits at an average distance of 1.900 AU. Its orbit is nearly circular (eccentricity 0.030).
How Was HD 22532 b Discovered?
HD 22532 b was discovered in 2022 using the radial velocity method, with observations from La Silla Observatory.
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 22532 b?
HD 22532 b is 525.7 light-years (161.2 parsecs) from Earth. Light arriving here tonight left the planet around the year 1501. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 9,252,320 years to make the journey.
Earth Similarity Index
The Earth Similarity Index (ESI) scores how physically similar a planet is to Earth, from 0 to 1, based on radius, density, escape velocity and surface temperature. HD 22532 b scores 0.23, ranking #3,572 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 22532
HD 22532
- Spectral type
- G8 III/IV
- Surface temperature
- 5,038 K (Sun: 5,772 K)
- Mass
- 1.57 M☉
- Radius
- 5.69 R☉
- Luminosity
- 18.8001 L☉
Planetary System
HD 22532 b is the only planet known to orbit HD 22532 so far.
HD 22532 b — Complete Data
| Mass (best estimate) | 673.80 Earth masses |
|---|---|
| Orbital period | 872.60 days |
| Orbital distance | 1.900 AU |
| Eccentricity | 0.030 |
| Earth Similarity Index | 0.23 |
| Distance from Earth | 525.7 light-years (161.2 parsecs) |
| Constellation | Horologium |
| Discovery method | Radial Velocity |
| Discovery facility | La Silla Observatory |
| Discovery year | 2022 |
Data: NASA Exoplanet Archive, last updated 2022-02-01. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 22532 b
Is HD 22532 b habitable?
No — HD 22532 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 22532 b?
HD 22532 b is about 526 light-years from Earth in the constellation Horologium. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 9,252,320 years to get there.
How long is a year on HD 22532 b?
One orbit around HD 22532 takes 872.6 Earth days.
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