K2-138 g
Orbiting K2-138
K2-138 g is an exoplanet orbiting the star K2-138, discovered in 2021 using the Transit method. It is a Mini-Neptune world.
Radius
3.01
Earth radii
Mass
4.32
Earth masses
Orbital Period
42.0
days
Distance
202.6
parsecs
Radius (Earth radii)
3.01
Mass (Earth masses)
4.32
Measured
Equilibrium Temperature
Unknown
Parameter source: Lopez et al. 2019
Orbital Period
41.968+0.008−0.007days
Semi-Major Axis
0.2311+0.0015−0.0020au
Planet Mass (Earth masses)
4.32+5.26−3.03
Planet Mass (Jupiter masses)
0.0136+0.0165−0.0095
Eccentricity
0.0590+0.0630−0.0400
Argument of Periastron
164.0+92.0−72.0deg
Radial Velocity Semi-Amplitude
0.83+1.02−0.58m/s
Distance from Earth
202.6 pc (~661 ly)
Spectral Type
Unknown
Temperature
5356 K
Mass (Solar)
0.94 M☉
Radius (Solar)
0.86 R☉
Luminosity
Unknown
Planets in System
6
Stars in System
1
Coordinates (RA, Dec)
348.9490°, -10.8497°
Discovery Method
Transit
Discovery Year
2021
Source ID: K2-138 g
K2-138 g orbits K2-138 and was reported in 2021 and was detected with the Transit method.
Published measurements list a radius of 3.01 Earth radii, a mass of 4.32 Earth masses, and an orbital period of 41.97 days.
Catalog data places the system at about 202.6 parsecs from Earth and 6 known planets in the system.
Host star
Explore the stellar record for this system to compare temperature, spectral type, and known planets.
Open K2-138