HD 3167 d
HD 3167 d is a super-Earth orbiting HD 3167 in the constellation Pisces. It lies about 154 light-years from Earth and was discovered in 2017 using the radial velocity method.
Is HD 3167 d in the Habitable Zone?
HD 3167 d orbits inside the inner edge of the habitable zone of HD 3167. So close to its star, surface conditions are far too hot for liquid water.
Habitable zone of HD 3167: 0.564–1.350 AU (conservative: 0.714–1.280 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 3167 d — one full orbit around HD 3167 — lasts 8.41 Earth days, shorter than Mercury's 88-day year. It orbits at an average distance of 0.076 AU — closer to its star than Mercury is to the Sun. Its orbit is mildly elliptical (eccentricity 0.12).
How Was HD 3167 d Discovered?
HD 3167 d was discovered in 2017 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 3167 d?
HD 3167 d is 154.2 light-years (47.3 parsecs) from Earth. Light arriving here tonight left the planet around the year 1872. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 2,713,920 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 3167 d scores 0.27, ranking #2,497 of 5,568 planets with a known ESI. For reference, Mars scores about 0.70.
The Host Star: HD 3167
HD 3167
- Surface temperature
- 5,261 K (Sun: 5,772 K)
- Mass
- 0.84 M☉
- Radius
- 0.88 R☉
- Age
- 7.8 billion years (Sun: 4.6)
The HD 3167 Planetary System
HD 3167 d is one of 4 known planets in the HD 3167 system. Its siblings:
HD 3167 d — Complete Data
| Mass (best estimate) | 4.33 Earth masses |
|---|---|
| Orbital period | 8.41 days |
| Orbital distance | 0.076 AU |
| Eccentricity | 0.120 |
| Earth Similarity Index | 0.27 |
| Distance from Earth | 154.2 light-years (47.3 parsecs) |
| Constellation | Pisces |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2017 |
Data: NASA Exoplanet Archive, last updated 2023-04-17. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 3167 d
Is HD 3167 d habitable?
No — HD 3167 d orbits too close to its star and is too hot for liquid water to exist on its surface.
How far away is HD 3167 d?
HD 3167 d is about 154 light-years from Earth in the constellation Pisces. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 2,713,920 years to get there.
How long is a year on HD 3167 d?
One orbit around HD 3167 takes 8.4 Earth days — short enough that 43 of its years would fit into one Earth year.
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