K2-138 e
Orbiting K2-138
K2-138 e is an exoplanet orbiting the star K2-138, discovered in 2017 using the Transit method. It is a Mini-Neptune world.
Radius
3.39
Earth radii
Mass
12.97
Earth masses
Orbital Period
8.3
days
Distance
202.6
parsecs
Radius (Earth radii)
3.39
Mass (Earth masses)
12.97
Measured
Equilibrium Temperature
Unknown
Parameter source: Lopez et al. 2019
Orbital Period
8.261+0.000−0.000days
Semi-Major Axis
0.0782+0.0005−0.0007au
Planet Mass (Earth masses)
12.97+1.98−1.99
Planet Mass (Jupiter masses)
0.0408+0.0062−0.0063
Eccentricity
0.0770+0.0480−0.0490
Argument of Periastron
180.0+40.0−44.0deg
Radial Velocity Semi-Amplitude
4.31+0.67−0.67m/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
2017
Source ID: K2-138 e
K2-138 e orbits K2-138 and was reported in 2017 and was detected with the Transit method.
Published measurements list a radius of 3.39 Earth radii, a mass of 12.97 Earth masses, and an orbital period of 8.26 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