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HAT-P-21 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/HAT-P-21 b

Confirmed exoplanet · Gas Giant

HAT-P-21 b

Orbiting HAT-P-21

Discovered in 2010 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 HAT-P-21 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,010
Method: Transit
Radius: 12.44199 R⊕
Mass: 1,547.8321 M⊕
Orbit: 4.12448 days
Distance: 277.278 pc

Planet profile

Orbit and physical properties

Orbital period: 4.12448 days
Semi-major axis: 0.05037 AU
Eccentricity: 0.23
Radius: 12.44199 Earth radii
Mass: 1,547.8321 Earth masses
Mass provenance: Mass
Density: 3.633781 g/cm³
Equilibrium temperature: 1,367 K
Insolation: 459.542 Earth flux

Host system

Star and system properties

Host star: HAT-P-21
Stars in system: 1
Known planets in system: 1
Spectral type: G3
Stellar temperature: 5,588 K
Stellar radius: 1.21 R☉
Stellar mass: 1.24 M☉
Stellar metallicity: 0.01 dex
Stellar age: 10.2 Gyr
Distance: 277.278 parsecs
Right ascension: 11h25m05.98s
Declination: +41d01m40.87s

Discovery

Detection and provenance

Discovery method: Transit
Discovery year: 2,010
Publication date: 2011-12
Discovery locale: Ground
Facility: HATNet
Telescope: Canon 200mm f/1.8L
Instrument: 2K CCD Sensor
NASA Exoplanet Archive: Open composite record ↗

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