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HD 191939 d | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/HD 191939 d

Confirmed exoplanet · Neptune Like

HD 191939 d

Orbiting HD 191939

Discovered in 2020 using Transit. 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 191939 d — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,020
Method: Transit
Radius: 2.995 R⊕
Mass: 2.8 M⊕
Orbit: 38.353037 days
Distance: 53.6089 pc

Planet profile

Orbit and physical properties

Orbital period: 38.353037 days
Semi-major axis: 0.2132 AU
Eccentricity: 0.031
Radius: 2.995 Earth radii
Mass: 2.8 Earth masses
Mass provenance: Mass
Density: 0.57 g/cm³
Equilibrium temperature: 540 K
Insolation: 14.3 Earth flux

Host system

Star and system properties

Host star: HD 191939
Stars in system: 1
Known planets in system: 6
Spectral type: G9 V
Stellar temperature: 5,348 K
Stellar radius: 0.94 R☉
Stellar mass: 0.81 M☉
Stellar metallicity: -0.15 dex
Stellar age: 8.7 Gyr
Distance: 53.6089 parsecs
Right ascension: 20h08m06.15s
Declination: +66d51m01.09s

Discovery

Detection and provenance

Discovery method: Transit
Discovery year: 2,020
Publication date: 2020-09
Discovery locale: Space
Facility: Transiting Exoplanet Survey Satellite (TESS)
Telescope: 0.1 m TESS Telescope
Instrument: TESS CCD Array
NASA Exoplanet Archive: Open composite record ↗

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