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HD 20781 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/HD 20781 b

Confirmed exoplanet · Terrestrial

HD 20781 b

Orbiting HD 20781

Discovered in 2019 using Radial Velocity. This page reflects the latest synchronized NASA Exoplanet Archive composite record.

NASA Archive record ↗Back to catalog →

Generic terrestrial catalog artwork; not a direct image of HD 20781 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,019
Method: Radial Velocity
Radius: 1.21 R⊕
Mass: 1.93 M⊕
Orbit: 5.3135 days
Distance: 35.9715 pc

Planet profile

Orbit and physical properties

Orbital period: 5.3135 days
Semi-major axis: 0.0529 AU
Eccentricity: 0.1
Radius: 1.21 Earth radii
Mass: 1.93 Earth masses
Mass provenance: Msini
Density: 5.99 g/cm³
Equilibrium temperature: 1,006.1 K
Insolation: 175.0994 Earth flux

Host system

Star and system properties

Host star: HD 20781
Stars in system: 2
Known planets in system: 5
Spectral type: K0 V
Stellar temperature: 5,256 K
Stellar radius: 0.833609 R☉
Stellar mass: 0.7 M☉
Stellar metallicity: -0.11 dex
Stellar age: Not reported by the NASA Exoplanet Archive
Distance: 35.9715 parsecs
Right ascension: 03h20m03.35s
Declination: -28d47m02.82s

Discovery

Detection and provenance

Discovery method: Radial Velocity
Discovery year: 2,019
Publication date: 2019-02
Discovery locale: Ground
Facility: La Silla Observatory
Telescope: 3.6 m ESO Telescope
Instrument: HARPS Spectrograph
NASA Exoplanet Archive: Open composite record ↗

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