The GJ 229 system contains 2 exoplanets. It is located 18.77 light years away from the solar system.
| Mass | 0.51 solar masses |
| Radius | 0.46 solar radiae |
| Temperature | 3912.54 kelvin |
| Stellar Metallicity | - decimal exponent |
| Age | 0.4 billion years |
At more than 10 Earth masses, GJ 229 c is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune.
| Mass | 8.576 Earth masses |
| Density | 1.990 grams per cubic centimeter |
| Radius | 2.870 Earth radiae |
| Semi-major Axis | 0.384214 AU |
| Eccentricity | 0.365639 |
| Orbital Period | 121.933 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Multiple Facilities |
| Discovery Telescope | Multiple Telescopes |
| Discovery Instrument | Multiple Instruments |
| Discovery Date | 2020-01 |
| Reference | Feng et al. 2020 |
At more than 10 Earth masses, GJ 229 b is an ice giant, a planet that is made up mostly of volatiles like water, amonia and methane, and enveloped by a dense hydrogen and helium atmosphere, much like Uranus and Neptune.
| Mass | 14.850 Earth masses |
| Density | 1.310 grams per cubic centimeter |
| Radius | 3.960 Earth radiae |
| Semi-major Axis | 1.086215 AU |
| Eccentricity | 0.403522 |
| Orbital Period | 579.475 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | Multiple Observatories |
| Discovery Telescope | Multiple Telescopes |
| Discovery Instrument | Multiple Instruments |
| Discovery Date | 2014-06 |
| Reference | Tuomi et al. 2014 |