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HD 20781 d | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/HD 20781 d

Confirmed exoplanet · Neptune Like

HD 20781 d

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 neptune like catalog artwork; not a direct image of HD 20781 d — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,019
Method: Radial Velocity
Radius: 3.25 R⊕
Mass: 10.61 M⊕
Orbit: 29.158 days
Distance: 35.9715 pc

Planet profile

Orbit and physical properties

Orbital period: 29.158 days
Semi-major axis: 0.1647 AU
Eccentricity: 0.11
Radius: 3.25 Earth radii
Mass: 10.61 Earth masses
Mass provenance: Msini
Density: 1.7 g/cm³
Equilibrium temperature: 570.19 K
Insolation: 18.0638 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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