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Missions Planets Black Holes 3D Map Agencies Blog About apexandromeda.com

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HD 221420 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/HD 221420 b

Confirmed exoplanet · Gas Giant

HD 221420 b

Orbiting HD 221420

Discovered in 2019 using Radial Velocity. 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 HD 221420 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,019
Method: Radial Velocity
Radius: 12 R⊕
Mass: 7,278.27052 M⊕
Orbit: 10,090 days
Distance: 31.1415 pc

Planet profile

Orbit and physical properties

Orbital period: 10,090 days
Semi-major axis: 10.15 AU
Eccentricity: 0.14
Radius: 12 Earth radii
Mass: 7,278.27052 Earth masses
Mass provenance: Mass
Density: 23.1 g/cm³
Equilibrium temperature: 123.49 K
Insolation: 0.0389 Earth flux

Host system

Star and system properties

Host star: HD 221420
Stars in system: 1
Known planets in system: 1
Spectral type: G2 IV-V
Stellar temperature: 5,847 K
Stellar radius: 1.947 R☉
Stellar mass: 1.351 M☉
Stellar metallicity: 0.33 dex
Stellar age: 3.65 Gyr
Distance: 31.1415 parsecs
Right ascension: 23h33m19.66s
Declination: -77d23m07.18s

Discovery

Detection and provenance

Discovery method: Radial Velocity
Discovery year: 2,019
Publication date: 2019-06
Discovery locale: Ground
Facility: Anglo-Australian Telescope
Telescope: 3.9 m Anglo-Australian Telescope
Instrument: UCLES Spectrograph
NASA Exoplanet Archive: Open composite record ↗

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