The GJ 3138 system contains 3 exoplanets. It is located 92.86 light years away from the solar system.
Mass | 0.68 solar masses |
Radius | 0.5 solar radiae |
Temperature | 3717 kelvin |
Stellar Metallicity | -0.3 decimal exponent |
Age | - billion years |
At 1.781 Earth masses, GJ 3138 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 | 1.780 Earth masses |
Density | 5.950 grams per cubic centimeter |
Radius | 1.180 Earth radiae |
Semi-major Axis | 0.0197 AU |
Eccentricity | 0.19 |
Orbital Period | 1.220 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 |
With a mass below 5 Earth masses, a density of 3.46, and a semi-major axis of 0.057 astronomical units, GJ 3138 c could, potentially, be an ocean world - a planet with no dry land.
Mass | 4.180 Earth masses |
Density | 3.460 grams per cubic centimeter |
Radius | 1.880 Earth radiae |
Semi-major Axis | 0.057 AU |
Eccentricity | 0.11 |
Orbital Period | 5.974 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 more than 10 Earth masses, GJ 3138 d 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 | 10.500 Earth masses |
Density | 1.710 grams per cubic centimeter |
Radius | 3.230 Earth radiae |
Semi-major Axis | 0.698 AU |
Eccentricity | 0.32 |
Orbital Period | 257.800 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 |