The HD 20794 System
HD 20794 is a planetary system in the constellation Eridanus hosting 4 confirmed exoplanets, about 20 light-years from Earth. One of its planets orbits within the habitable zone, where liquid water could exist on a planetary surface.
HD 20794: Star and Habitable Zone
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☉
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.
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All 4 Planets in the HD 20794 System
| Planet | Type | Orbit | Radius | ESI | Discovered |
|---|---|---|---|---|---|
| HD 20794 b | Super Earth | 18 d | — | 0.31 | 2011 |
| HD 20794 d | Super Earth | 90 d | — | 0.45 | 2011 |
| HD 20794 e | Super Earth | 147 d | — | 0.59 | 2017 |
| HD 20794 f HZ | Super Earth | 648 d | — | — | 2025 |
Discovery History
The first planet found here, HD 20794 b, was discovered in 2011 using the radial velocity method. The most recent addition, HD 20794 f, followed in 2025.
- 2011 — HD 20794 b (Radial Velocity)
- 2011 — HD 20794 d (Radial Velocity)
- 2017 — HD 20794 e (Radial Velocity)
- 2025 — HD 20794 f (Radial Velocity)
Frequently Asked Questions About HD 20794
How many planets does HD 20794 have?
HD 20794 has 4 confirmed exoplanets. More may await discovery.
Are any planets in the HD 20794 system habitable?
One planet in the system orbits within the habitable zone, where liquid water could exist. Actual habitability depends on atmospheres and composition, which are not yet known.
How far away is HD 20794?
HD 20794 is about 20 light-years from Earth in the constellation Eridanus.
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