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GJ 581 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/GJ 581 b

Confirmed exoplanet · Neptune Like

GJ 581 b

Orbiting GJ 581

Discovered in 2005 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 GJ 581 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,005
Method: Radial Velocity
Radius: 4.79 R⊕
Mass: 20.5 M⊕
Orbit: 5.3686 days
Distance: 6.2981 pc

Planet profile

Orbit and physical properties

Orbital period: 5.3686 days
Semi-major axis: 0.0399 AU
Eccentricity: 0.0342
Radius: 4.79 Earth radii
Mass: 20.5 Earth masses
Mass provenance: Mass
Density: 1.02 g/cm³
Equilibrium temperature: 464.32 K
Insolation: 7.7669 Earth flux

Host system

Star and system properties

Host star: GJ 581
Stars in system: 1
Known planets in system: 3
Spectral type: M3.0 V
Stellar temperature: 3,500 K
Stellar radius: 0.302 R☉
Stellar mass: 0.295 M☉
Stellar metallicity: -0.08 dex
Stellar age: 4.3 Gyr
Distance: 6.2981 parsecs
Right ascension: 15h19m25.55s
Declination: -07d43m21.70s

Discovery

Detection and provenance

Discovery method: Radial Velocity
Discovery year: 2,005
Publication date: 2005-12
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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