The HD 81817 system contains 2 exoplanets. It is located 877.77 light years away from the solar system.
| Mass | 4.3 solar masses |
| Radius | 83.8 solar radiae |
| Temperature | 4140 kelvin |
| Stellar Metallicity | -0.17 decimal exponent |
| Age | 0.15 billion years |
At more than 50 Earth masses, HD 81817 b is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 8433.903 Earth masses |
| Density | 27.500 grams per cubic centimeter |
| Radius | 11.900 Earth radiae |
| Semi-major Axis | 3.233953 AU |
| Eccentricity | 0.097258 |
| Orbital Period | 1021.202 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Bohyunsan Optical Astronomical Observatory |
| Discovery Telescope | 1.8 m Telescope |
| Discovery Instrument | BOES Echelle Spectrograph |
| Discovery Date | 2020-06 |
| Reference | Bang et al. 2020 |
At more than 50 Earth masses, HD 81817 c is a gas giant, a planet whose mass is mostly made up of hydrogen and helium, like Jupiter and Saturn.
| Mass | 7180.542 Earth masses |
| Density | 22.800 grams per cubic centimeter |
| Radius | 12.000 Earth radiae |
| Semi-major Axis | 2.324089 AU |
| Eccentricity | 0.095429 |
| Orbital Period | 622.978 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Multiple Observatories |
| Discovery Telescope | Multiple Telescopes |
| Discovery Instrument | Multiple Instruments |
| Discovery Date | 2022-09 |
| Reference | Feng et al. 2022 |