The G 9-40 system contains 1 exoplanet. It is located 91.09 light years away from the solar system.
| Mass | 0.29 solar masses |
| Radius | 0.31 solar radiae |
| Temperature | 3348 kelvin |
| Stellar Metallicity | 0.04 decimal exponent |
| Age | 9.9 billion years |
With a mass below 5 Earth masses, a density of 3.15, and a semi-major axis of 0.0385 astronomical units, G 9-40 b could, potentially, be an ocean world - a planet with no dry land.
| Mass | 4.760 Earth masses |
| Density | 3.150 grams per cubic centimeter |
| Radius | 2.025 Earth radiae |
| Semi-major Axis | 0.0385 AU |
| Eccentricity | 0 |
| Orbital Period | 5.746 days |
| Discovery Method | Transit |
| Discovery Facility | K2 |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2020-03 |
| Reference | Stefansson et al. 2020 |