The GJ 273 system contains 2 exoplanets. It is located 19.31 light years away from the solar system.
| Mass | 0.29 solar masses |
| Radius | 0.29 solar radiae |
| Temperature | 3382 kelvin |
| Stellar Metallicity | 0.09 decimal exponent |
| Age | - billion years |
At 2.891 Earth masses, GJ 273 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 | 2.890 Earth masses |
| Density | 4.610 grams per cubic centimeter |
| Radius | 1.510 Earth radiae |
| Semi-major Axis | 0.091101 AU |
| Eccentricity | 0.1 |
| Orbital Period | 18.650 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 3.6 m ESO Telescope |
| Discovery Instrument | HARPS Spectrograph |
| Discovery Date | 2017-06 |
| Reference | Astudillo-Defru et al. 2017 |
At less than 1.5 Earth masses, GJ 273 c is a terrestrial planet, much like the terrestrial planets we find in our solar system, namely Mercury, Venus, Earth and Mars.
| Mass | 1.180 Earth masses |
| Density | 5.440 grams per cubic centimeter |
| Radius | 1.060 Earth radiae |
| Semi-major Axis | 0.036467 AU |
| Eccentricity | 0.17 |
| Orbital Period | 4.723 days |
| Discovery Method | Radial Velocity |
| Discovery Facility | La Silla Observatory |
| Discovery Telescope | 3.6 m ESO Telescope |
| Discovery Instrument | HARPS Spectrograph |
| Discovery Date | 2017-06 |
| Reference | Astudillo-Defru et al. 2017 |