The HD 20794 system contains 4 exoplanets. It is located 19.58 light years away from the solar system.
| Mass | 0.7 solar masses |
| Radius | 0.92 solar radiae |
| Temperature | 5401 kelvin |
| Stellar Metallicity | -0.4 decimal exponent |
| Age | 5.76 billion years |
At 2.703 Earth masses, HD 20794 b is a so called Super Earth. Super Earths could be terrestrial worlds like Earth, but they could also be ocean worlds or terrestrial worlds wrapped in a substantial atmosphere, in which case some refer to them as Mini Neptunes.
| Mass | 2.700 Earth masses |
| Density | 4.870 grams per cubic centimeter |
| Radius | 1.450 Earth radiae |
| Semi-major Axis | 0.1207 AU |
| Eccentricity | 0 |
| Orbital Period | 18.315 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 3.6 m ESO Telescope |
| Discovery Instrument | HARPS Spectrograph |
| Discovery Date | 2011-10 |
| Reference | Pepe et al. 2011 |
At 2.417 Earth masses, HD 20794 c is a so called Super Earth. Super Earths could be terrestrial worlds like Earth, but they could also be ocean worlds or terrestrial worlds wrapped in a substantial atmosphere, in which case some refer to them as Mini Neptunes.
| Mass | 2.400 Earth masses |
| Density | 5.360 grams per cubic centimeter |
| Radius | 1.350 Earth radiae |
| Semi-major Axis | 0.2036 AU |
| Eccentricity | 0 |
| Orbital Period | 40.114 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 3.6 m ESO Telescope |
| Discovery Instrument | HARPS Spectrograph |
| Discovery Date | 2011-10 |
| Reference | Pepe et al. 2011 |
With a mass below 5 Earth masses, a density of 3.11, and a semi-major axis of 0.3499 astronomical units, HD 20794 d could, potentially, be an ocean world - a planet with no dry land.
| Mass | 4.800 Earth masses |
| Density | 3.110 grams per cubic centimeter |
| Radius | 2.040 Earth radiae |
| Semi-major Axis | 0.3499 AU |
| Eccentricity | 0 |
| Orbital Period | 90.309 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 3.6 m ESO Telescope |
| Discovery Instrument | HARPS Spectrograph |
| Discovery Date | 2011-10 |
| Reference | Pepe et al. 2011 |
With a mass below 5 Earth masses, a density of 3.13, and a semi-major axis of 0.509 astronomical units, HD 20794 e could, potentially, be an ocean world - a planet with no dry land.
| Mass | 4.770 Earth masses |
| Density | 3.130 grams per cubic centimeter |
| Radius | 2.030 Earth radiae |
| Semi-major Axis | 0.509 AU |
| Eccentricity | 0.29 |
| Orbital Period | 147.020 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 3.6 m ESO Telescope |
| Discovery Instrument | HARPS Spectrograph |
| Discovery Date | 2017-09 |
| Reference | Feng et al. 2017 |