The GJ 9827 system contains 3 exoplanets. It is located 96.74 light years away from the solar system.
| Mass | 0.61 solar masses |
| Radius | 0.6 solar radiae |
| Temperature | 4340 kelvin |
| Stellar Metallicity | -0.26 decimal exponent |
| Age | 10 billion years |
At 4.913 Earth masses, GJ 9827 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 | 4.910 Earth masses |
| Density | 6.930 grams per cubic centimeter |
| Radius | 1.577 Earth radiae |
| Semi-major Axis | 0.0188 AU |
| Eccentricity | 0 |
| Orbital Period | 1.209 days |
| Discovery Method | Transit |
| Discovery Facility | K2 |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2017-12 |
| Reference | Niraula et al. 2017 |
With a mass below 5 Earth masses, a density of 2.42, and a semi-major axis of 0.03925 astronomical units, GJ 9827 c could, potentially, be an ocean world - a planet with no dry land.
| Mass | 0.840 Earth masses |
| Density | 2.420 grams per cubic centimeter |
| Radius | 1.241 Earth radiae |
| Semi-major Axis | 0.03925 AU |
| Eccentricity | 0 |
| Orbital Period | 3.648 days |
| Discovery Method | Transit |
| Discovery Facility | K2 |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2017-12 |
| Reference | Niraula et al. 2017 |
With a mass below 5 Earth masses, a density of 2.69, and a semi-major axis of 0.05591 astronomical units, GJ 9827 d could, potentially, be an ocean world - a planet with no dry land.
| Mass | 4.040 Earth masses |
| Density | 2.690 grams per cubic centimeter |
| Radius | 2.022 Earth radiae |
| Semi-major Axis | 0.05591 AU |
| Eccentricity | 0 |
| Orbital Period | 6.201 days |
| Discovery Method | Transit |
| Discovery Facility | K2 |
| Discovery Telescope | 0.95 m Kepler Telescope |
| Discovery Instrument | Kepler CCD Array |
| Discovery Date | 2017-12 |
| Reference | Niraula et al. 2017 |