HD 20794 f
HD 20794 f is a super-Earth orbiting the G6 V star HD 20794 in the constellation Eridanus. It lies about 20 light-years from Earth and was discovered in 2025 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 20794 f in the Habitable Zone?
HD 20794 f orbits inside the conservative habitable zone of HD 20794 — the region where a rocky planet could sustain liquid water on its surface. This makes it one of the most interesting known exoplanets in the search for life.
Habitable zone of HD 20794: 0.637–1.519 AU (conservative: 0.807–1.440 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 20794 f — one full orbit around HD 20794 — lasts 647.6 Earth days, longer than an Earth year. It orbits at an average distance of 1.354 AU. Its orbit is highly elliptical (eccentricity 0.45), swinging dramatically closer to and farther from its star.
How Was HD 20794 f Discovered?
HD 20794 f was discovered in 2025 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 20794 f?
HD 20794 f is 19.6 light-years (6.0 parsecs) from Earth. Light arriving here tonight left the planet around the year 2007. A probe traveling at the speed of Voyager 1 — about 17 km/s, the fastest outbound spacecraft ever launched — would need roughly 344,960 years to make the journey.
The Host Star: HD 20794
HD 20794
- Spectral type
- G6 V
- Surface temperature
- 5,368 K (Sun: 5,772 K)
- Mass
- 0.79 M☉
- Radius
- 0.93 R☉
- Luminosity
- 0.6869 L☉
The HD 20794 Planetary System
HD 20794 f is one of 4 known planets in the HD 20794 system. Its siblings:
- HD 20794 b (Super Earth)
- HD 20794 d (Super Earth)
- HD 20794 e (Super Earth)
HD 20794 f — Complete Data
| Mass (best estimate) | 5.82 Earth masses |
|---|---|
| Orbital period | 647.60 days |
| Orbital distance | 1.354 AU |
| Eccentricity | 0.450 |
| Distance from Earth | 19.6 light-years (6.0 parsecs) |
| Constellation | Eridanus |
| Discovery method | Radial Velocity |
| Discovery facility | Multiple Observatories |
| Discovery year | 2025 |
Data: NASA Exoplanet Archive, last updated 2025-02-12. Earth Similarity Index: PHL @ UPR Arecibo.
Frequently Asked Questions About HD 20794 f
Is HD 20794 f habitable?
HD 20794 f orbits within the habitable zone of HD 20794, the region where liquid water could exist on a planet's surface. It sits in the conservative habitable zone — the most promising region for habitability. Whether it is actually habitable depends on its atmosphere and composition, which remain unknown.
How far away is HD 20794 f?
HD 20794 f is about 20 light-years from Earth in the constellation Eridanus. A spacecraft traveling as fast as Voyager 1 (about 17 km/s) would need roughly 344,960 years to get there.
How long is a year on HD 20794 f?
One orbit around HD 20794 takes 647.6 Earth days.
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