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HD 209458 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/HD 209458 b

Confirmed exoplanet · Gas Giant

HD 209458 b

Orbiting HD 209458

Discovered in 1999 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 209458 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 1,999
Method: Radial Velocity
Radius: 15.58051 R⊕
Mass: 232.0159 M⊕
Orbit: 3.524749 days
Distance: 48.3016 pc

Planet profile

Orbit and physical properties

Orbital period: 3.524749 days
Semi-major axis: 0.04707 AU
Eccentricity: 0
Radius: 15.58051 Earth radii
Mass: 232.0159 Earth masses
Mass provenance: Mass
Density: 0.362 g/cm³
Equilibrium temperature: 1,459 K
Insolation: 587.098 Earth flux

Host system

Star and system properties

Host star: HD 209458
Stars in system: 1
Known planets in system: 1
Spectral type: G0 V
Stellar temperature: 6,091 K
Stellar radius: 1.19 R☉
Stellar mass: 1.23 M☉
Stellar metallicity: 0.01 dex
Stellar age: 3.1 Gyr
Distance: 48.3016 parsecs
Right ascension: 22h03m10.81s
Declination: +18d53m03.27s

Discovery

Detection and provenance

Discovery method: Radial Velocity
Discovery year: 1,999
Publication date: 2000-01
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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