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HD 128311 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/HD 128311 b

Confirmed exoplanet · Gas Giant

HD 128311 b

Orbiting HD 128311

Discovered in 2002 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 128311 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,002
Method: Radial Velocity
Radius: 13.5 R⊕
Mass: 562.24127 M⊕
Orbit: 453.019 days
Distance: 16.3292 pc

Planet profile

Orbit and physical properties

Orbital period: 453.019 days
Semi-major axis: 1.084 AU
Eccentricity: 0.303
Radius: 13.5 Earth radii
Mass: 562.24127 Earth masses
Mass provenance: Msini
Density: 1.26 g/cm³
Equilibrium temperature: 200.47 K
Insolation: 0.262 Earth flux

Host system

Star and system properties

Host star: HD 128311
Stars in system: 1
Known planets in system: 2
Spectral type: K0
Stellar temperature: 4,965 K
Stellar radius: 0.76 R☉
Stellar mass: 0.828 M☉
Stellar metallicity: 0.08 dex
Stellar age: 0.96 Gyr
Distance: 16.3292 parsecs
Right ascension: 14h36m00.78s
Declination: +09d44m43.57s

Discovery

Detection and provenance

Discovery method: Radial Velocity
Discovery year: 2,002
Publication date: 2003-01
Discovery locale: Ground
Facility: W. M. Keck Observatory
Telescope: 10 m Keck I Telescope
Instrument: HIRES Spectrometer
NASA Exoplanet Archive: Open composite record ↗

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