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KELT-21 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/KELT-21 b

Confirmed exoplanet · Gas Giant

KELT-21 b

Orbiting KELT-21

Discovered in 2018 using Transit. This page reflects the latest synchronized NASA Exoplanet Archive composite record.

NASA Archive record ↗Back to catalog →

Generic gas giant catalog artwork; not a direct image of KELT-21 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,018
Method: Transit
Radius: 17.777474 R⊕
Mass: 1,242.7153 M⊕
Orbit: 3.612765 days
Distance: 470.878 pc

Planet profile

Orbit and physical properties

Orbital period: 3.612765 days
Semi-major axis: 0.05224 AU
Eccentricity: 0
Radius: 17.777474 Earth radii
Mass: 1,242.7153 Earth masses
Mass provenance: Mass
Density: 1.24 g/cm³
Equilibrium temperature: 2,051 K
Insolation: 2,950 Earth flux

Host system

Star and system properties

Host star: KELT-21
Stars in system: 1
Known planets in system: 1
Spectral type: A8 V
Stellar temperature: 7,598 K
Stellar radius: 1.638 R☉
Stellar mass: 1.458 M☉
Stellar metallicity: -0.405 dex
Stellar age: 1.6 Gyr
Distance: 470.878 parsecs
Right ascension: 20h19m12.01s
Declination: +32d34m51.76s

Discovery

Detection and provenance

Discovery method: Transit
Discovery year: 2,018
Publication date: 2018-02
Discovery locale: Ground
Facility: KELT-North
Telescope: Mamiya 645 80mm f/1.9
Instrument: Apogee 4K CCD Sensor
NASA Exoplanet Archive: Open composite record ↗

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