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K2-138 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/K2-138 b

Confirmed exoplanet · Super Earth

K2-138 b

Orbiting K2-138

Discovered in 2017 using Transit. This page reflects the latest synchronized NASA Exoplanet Archive composite record.

NASA Archive record ↗Back to catalog →

Kepler K2-138 System (Artist's Concept), an official NASA exoplanet image or artist concept — Sourced object or system artworkNASA/JPL-Caltech

Discovery: 2,017
Method: Transit
Radius: 1.51 R⊕
Mass: 3.1 M⊕
Orbit: 2.35309 days
Distance: 202.585 pc

Planet profile

Orbit and physical properties

Orbital period: 2.35309 days
Semi-major axis: 0.03385 AU
Eccentricity: 0.048
Radius: 1.51 Earth radii
Mass: 3.1 Earth masses
Mass provenance: Mass
Density: 4.9 g/cm³
Equilibrium temperature: 1,157 K
Insolation: 486 Earth flux

Host system

Star and system properties

Host star: K2-138
Stars in system: 1
Known planets in system: 6
Spectral type: G8 V
Stellar temperature: 5,356.3 K
Stellar radius: 0.863 R☉
Stellar mass: 0.935 M☉
Stellar metallicity: 0.14 dex
Stellar age: 2.8 Gyr
Distance: 202.585 parsecs
Right ascension: 23h15m47.77s
Declination: -10d50m59.06s

Discovery

Detection and provenance

Discovery method: Transit
Discovery year: 2,017
Publication date: 2018-02
Discovery locale: Space
Facility: K2
Telescope: 0.95 m Kepler Telescope
Instrument: Kepler CCD Array
NASA Exoplanet Archive: Open composite record ↗

Visual archive

Gallery

One image from K2-138 b.

Kepler K2-138 System (Artist's Concept), an official NASA exoplanet image or artist concept — NASA/JPL-CaltechSource ↗