HD 10647 b
HD 10647 b is a cold gas giant orbiting the F9 V star HD 10647 in the constellation Eridanus. It lies about 57 light-years from Earth and was discovered in 2006 using the radial velocity method. It orbits within the habitable zone of its star — the region where liquid water could exist on a planet's surface.
Is HD 10647 b in the Habitable Zone?
HD 10647 b orbits within the optimistic habitable zone of HD 10647 — the broader region where liquid water might be possible under favorable atmospheric conditions.
Habitable zone of HD 10647: 0.867–2.023 AU (conservative: 1.099–1.918 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 10647 b — one full orbit around HD 10647 — lasts 989.2 Earth days, longer than an Earth year. It orbits at an average distance of 2.015 AU. Its orbit is mildly elliptical (eccentricity 0.15).
How Was HD 10647 b Discovered?
HD 10647 b was discovered in 2006 using the radial velocity method, with observations from W. M. Keck 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 10647 b?
HD 10647 b is 56.5 light-years (17.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1970. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 994,400 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 10647 b scores 0.30, ranking #1,358 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 10647
HD 10647
- Spectral type
- F9 V
- Surface temperature
- 6,218 K (Sun: 5,772 K)
- Mass
- 1.11 M☉
- Radius
- 1.10 R☉
- Luminosity
- 1.4093 L☉
- Age
- 1.4 billion years (Sun: 4.6)
Planetary System
HD 10647 b is the only planet known to orbit HD 10647 so far.
HD 10647 b — Complete Data
| Mass (best estimate) | 298.75 Earth masses |
|---|---|
| Orbital period | 989.20 days |
| Orbital distance | 2.015 AU |
| Eccentricity | 0.150 |
| Earth Similarity Index | 0.30 |
| Distance from Earth | 56.5 light-years (17.3 parsecs) |
| Constellation | Eridanus |
| Discovery method | Radial Velocity |
| Discovery facility | W. M. Keck Observatory |
| Discovery year | 2006 |
Data: NASA Exoplanet Archive, last updated 2014-05-14. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 10647 b
Is HD 10647 b habitable?
HD 10647 b orbits within the habitable zone of HD 10647, the region where liquid water could exist on a planet's surface. Whether it is actually habitable depends on its atmosphere and composition, which remain unknown.
How far away is HD 10647 b?
HD 10647 b is about 57 light-years from Earth in the constellation Eridanus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 994,400 years to get there.
How long is a year on HD 10647 b?
One orbit around HD 10647 takes 989.2 Earth days.
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