HD 10975 b
HD 10975 b is a cold gas giant orbiting the K0 III star HD 10975 in the constellation Andromeda. It lies about 380 light-years from Earth and was discovered in 2021 using the radial velocity method.
Is HD 10975 b in the Habitable Zone?
HD 10975 b orbits inside the inner edge of the habitable zone of HD 10975. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 10975: 6.195–15.076 AU (conservative: 7.847–14.293 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 10975 b — one full orbit around HD 10975 — lasts 283.8 Earth days, between the years of Mercury (88 days) and Earth (365 days). It orbits at an average distance of 0.950 AU — comparable to the inner Solar System. Its orbit is highly elliptical (eccentricity 0.44), swinging dramatically closer to and farther from its star.
How Was HD 10975 b Discovered?
HD 10975 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 10975 b?
HD 10975 b is 380.0 light-years (116.5 parsecs) from Earth. Light arriving here tonight left the planet around the year 1646. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 6,688,000 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 10975 b scores 0.08, ranking #4,745 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 10975
HD 10975
- Spectral type
- K0 III
- Surface temperature
- 4,840 K (Sun: 5,772 K)
- Mass
- 1.41 M☉
- Radius
- 11.16 R☉
- Luminosity
- 61.6396 L☉
Planetary System
HD 10975 b is the only planet known to orbit HD 10975 so far.
HD 10975 b — Complete Data
| Mass (best estimate) | 143.02 Earth masses |
|---|---|
| Orbital period | 283.80 days |
| Orbital distance | 0.950 AU |
| Eccentricity | 0.442 |
| Earth Similarity Index | 0.08 |
| Distance from Earth | 380.0 light-years (116.5 parsecs) |
| Constellation | Andromeda |
| 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 10975 b
Is HD 10975 b habitable?
No — HD 10975 b orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 10975 b?
HD 10975 b is about 380 light-years from Earth in the constellation Andromeda. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 6,688,000 years to get there.
How long is a year on HD 10975 b?
One orbit around HD 10975 takes 283.8 Earth days.
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