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HD 22781 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/HD 22781 b

Confirmed exoplanet · Gas Giant

HD 22781 b

Orbiting HD 22781

Discovered in 2011 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 22781 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,011
Method: Radial Velocity
Radius: 12.3 R⊕
Mass: 4,338.2 M⊕
Orbit: 528.07 days
Distance: 32.6034 pc

Planet profile

Orbit and physical properties

Orbital period: 528.07 days
Semi-major axis: 1.167 AU
Eccentricity: 0.8191
Radius: 12.3 Earth radii
Mass: 4,338.2 Earth masses
Mass provenance: Msini
Density: 12.8 g/cm³
Equilibrium temperature: 193.48 K
Insolation: 0.2456 Earth flux

Host system

Star and system properties

Host star: HD 22781
Stars in system: 1
Known planets in system: 1
Spectral type: K1
Stellar temperature: 5,027 K
Stellar radius: 0.743475 R☉
Stellar mass: 0.75 M☉
Stellar metallicity: -0.37 dex
Stellar age: 4.8 Gyr
Distance: 32.6034 parsecs
Right ascension: 03h40m49.57s
Declination: +31d49m33.19s

Discovery

Detection and provenance

Discovery method: Radial Velocity
Discovery year: 2,011
Publication date: 2012-02
Discovery locale: Ground
Facility: Haute-Provence Observatory
Telescope: 1.93 m Telescope
Instrument: SOPHIE Spectrograph
NASA Exoplanet Archive: Open composite record ↗

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