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HD 18438 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/HD 18438 b

Confirmed exoplanet · Gas Giant

HD 18438 b

Orbiting HD 18438

Discovered in 2023 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 18438 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,023
Method: Radial Velocity
Radius: 12.1 R⊕
Mass: 6,674.396547 M⊕
Orbit: 803 days
Distance: 224.146 pc

Planet profile

Orbit and physical properties

Orbital period: 803 days
Semi-major axis: 2.1 AU
Eccentricity: 0.1
Radius: 12.1 Earth radii
Mass: 6,674.396547 Earth masses
Mass provenance: Msini
Density: 20.7 g/cm³
Equilibrium temperature: 1,208.15 K
Insolation: 210.6576 Earth flux

Host system

Star and system properties

Host star: HD 18438
Stars in system: 1
Known planets in system: 1
Spectral type: M2.5 III
Stellar temperature: 3,860 K
Stellar radius: 88.475 R☉
Stellar mass: 1.84 M☉
Stellar metallicity: -0.4 dex
Stellar age: 5.5 Gyr
Distance: 224.146 parsecs
Right ascension: 03h06m07.64s
Declination: +79d25m06.89s

Discovery

Detection and provenance

Discovery method: Radial Velocity
Discovery year: 2,023
Publication date: 2023-03
Discovery locale: Ground
Facility: Bohyunsan Optical Astronomical Observatory
Telescope: 1.8 m Telescope
Instrument: BOES Echelle Spectrograph
NASA Exoplanet Archive: Open composite record ↗

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