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K2-21 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/K2-21 b

Confirmed exoplanet · Super Earth

K2-21 b

Orbiting K2-21

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

NASA Archive record ↗Back to catalog →

Generic super earth catalog artwork; not a direct image of K2-21 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,015
Method: Transit
Radius: 1.84 R⊕
Mass: 4.04 M⊕
Orbit: 9.325038 days
Distance: 83.6448 pc

Planet profile

Orbit and physical properties

Orbital period: 9.325038 days
Semi-major axis: 0.076 AU
Eccentricity: 0.1
Radius: 1.84 Earth radii
Mass: 4.04 Earth masses
Mass provenance: M-R relationship
Density: 2.7 g/cm³
Equilibrium temperature: 500 K
Insolation: 10 Earth flux

Host system

Star and system properties

Host star: K2-21
Stars in system: 1
Known planets in system: 2
Spectral type: M0.0
Stellar temperature: 4,222.06 K
Stellar radius: 0.646783 R☉
Stellar mass: 0.676023 M☉
Stellar metallicity: -0.11 dex
Stellar age: 1 Gyr
Distance: 83.6448 parsecs
Right ascension: 22h41m12.91s
Declination: -14d29m21.57s

Discovery

Detection and provenance

Discovery method: Transit
Discovery year: 2,015
Publication date: 2015-10
Discovery locale: Space
Facility: K2
Telescope: 0.95 m Kepler Telescope
Instrument: Kepler CCD Array
NASA Exoplanet Archive: Open composite record ↗

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