The GJ 436 system contains 1 exoplanet. It is located 31.81 light years away from the solar system.
| Mass | 0.47 solar masses |
| Radius | 0.46 solar radiae |
| Temperature | 3586.11 kelvin |
| Stellar Metallicity | 0.099 decimal exponent |
| Age | 6 billion years |
At more than 10 Earth masses, GJ 436 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 | 22.100 Earth masses |
| Density | 1.800 grams per cubic centimeter |
| Radius | 4.170 Earth radiae |
| Semi-major Axis | 0.0291 AU |
| Eccentricity | 0.13827 |
| Orbital Period | 2.644 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | W. M. Keck Observatory |
| Discovery Telescope | 10 m Keck I Telescope |
| Discovery Instrument | HIRES Spectrometer |
| Discovery Date | 2004-12 |
| Reference | Butler et al. 2004 |