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K2-18 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/K2-18 b

Confirmed exoplanet · Super Earth

K2-18 b

Orbiting K2-18

Discovered in 2015 using Transit. This page reflects the latest synchronized NASA Exoplanet Archive composite record.

NASA Archive record ↗Back to catalog →

Exoplanet K2-18 b (illustration), an official ESA/Webb exoplanet image or artist concept — Sourced object or system artworkNASA, CSA, ESA, J. Olmstead (STScI), N. Madhusudhan (Cambridge University)

Discovery: 2,015
Method: Transit
Radius: 2.37 R⊕
Mass: 8.92 M⊕
Orbit: 32.939623 days
Distance: 38.0266 pc

Planet profile

Orbit and physical properties

Orbital period: 32.939623 days
Semi-major axis: 0.1429 AU
Eccentricity: 0.2
Radius: 2.37 Earth radii
Mass: 8.92 Earth masses
Mass provenance: Mass
Density: 4.11 g/cm³
Equilibrium temperature: 284 K
Insolation: 1.005 Earth flux

Host system

Star and system properties

Host star: K2-18
Stars in system: 1
Known planets in system: 2
Spectral type: M2.5 V
Stellar temperature: 3,457 K
Stellar radius: 0.411 R☉
Stellar mass: 0.359 M☉
Stellar metallicity: 0.12 dex
Stellar age: Not reported by the NASA Exoplanet Archive
Distance: 38.0266 parsecs
Right ascension: 11h30m14.43s
Declination: +07d35m16.19s

Discovery

Detection and provenance

Discovery method: Transit
Discovery year: 2,015
Publication date: 2015-08
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 K2-18 b.

Exoplanet K2-18 b (illustration), an official ESA/Webb exoplanet image or artist concept — NASA, CSA, ESA, J. Olmstead (STScI), N. Madhusudhan (Cambridge University)Source ↗