HD 360 b
HD 360 b is a cold gas giant orbiting the G8 III star HD 360 in the constellation Cetus. It lies about 364 light-years from Earth and was discovered in 2021 using the radial velocity method.
Is HD 360 b in the Habitable Zone?
HD 360 b orbits inside the inner edge of the habitable zone of HD 360. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 360: 5.878–14.347 AU (conservative: 7.445–13.602 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.
See the full interactive habitable-zone view in the Exoplanet Explorer app ›
Orbit and Year Length
A year on HD 360 b — one full orbit around HD 360 — lasts 273.1 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.980 AU — comparable to the inner Solar System. Its orbit is mildly elliptical (eccentricity 0.14).
How Was HD 360 b Discovered?
HD 360 b was discovered in 2021 using the radial velocity method, with observations from Okayama Astrophysical 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 360 b?
HD 360 b is 363.8 light-years (111.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1663. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,402,880 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 360 b scores 0.08, ranking #4,620 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 360
HD 360
- Spectral type
- G8 III
- Surface temperature
- 4,770 K (Sun: 5,772 K)
- Mass
- 1.69 M☉
- Radius
- 10.86 R☉
- Luminosity
- 55.1595 L☉
Planetary System
HD 360 b is the only planet known to orbit HD 360 so far.
HD 360 b — Complete Data
| Mass (best estimate) | 238.37 Earth masses |
|---|---|
| Orbital period | 273.10 days |
| Orbital distance | 0.980 AU |
| Eccentricity | 0.139 |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 363.8 light-years (111.5 parsecs) |
| Constellation | Cetus |
| Discovery method | Radial Velocity |
| Discovery facility | Okayama Astrophysical Observatory |
| Discovery year | 2021 |
Data: NASA Exoplanet Archive, last updated 2022-01-10. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 360 b
Is HD 360 b habitable?
No — HD 360 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 360 b?
HD 360 b is about 364 light-years from Earth in the constellation Cetus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,402,880 years to get there.
How long is a year on HD 360 b?
One orbit around HD 360 takes 273.1 Earth days.
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