Exoplanet

K2-238 b

Orbiting K2-238

Overview

K2-238 b is an exoplanet orbiting the star K2-238, discovered in 2018 using the Transit method. It is a Jupiter-sized world.

Key Measurements

Radius

14.57

Earth radii

015 R⊕

Mass

273.33

Earth masses

0500 M⊕

Orbital Period

3.2

days

0.1d10,000d

Distance

538.0

parsecs

Nearby10,000 pc

Equilibrium Temp

1587

K

150 K3,500 K

Radius (Earth radii)

14.57

Mass (Earth masses)

273.33

Measured

Equilibrium Temperature

1587 K

Parameter source: Soto et al. 2018

Orbital Period

3.205+0.000−0.000days

Semi-Major Axis

0.0460+0.0070−0.0060au

Planet Mass (Earth masses)

273.33+41.32−38.14

Planet Mass (Jupiter masses)

0.8600+0.1300−0.1200

Eccentricity

0.0000

Argument of Periastron

90.0deg

Radial Velocity Semi-Amplitude

100.00+10.00−10.00m/s

Distance from Earth

538.0 pc (~1755 ly)

Spectral Type

G2 V

Temperature

5630 K

Mass (Solar)

1.19 M☉

Radius (Solar)

1.59 R☉

Luminosity

Unknown

Planets in System

1

Stars in System

1

Coordinates (RA, Dec)

347.7043°, -7.8576°

Discovery Method

Transit

Discovery Year

2018

Data Sources
NASA Exoplanet Archive

Source ID: K2-238 b

System Context

K2-238 b orbits K2-238 and was reported in 2018 and was detected with the Transit method.

Published measurements list a radius of 14.57 Earth radii, a mass of 273.33 Earth masses, an orbital period of 3.2 days, and an equilibrium temperature near 1,587 K.

Catalog data places the system at about 538 parsecs from Earth, a host star classified as G2 V, and 1 known planet in the system.

Host star

Explore the stellar record for this system to compare temperature, spectral type, and known planets.

Open K2-238