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GJ 436 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/GJ 436 b

Confirmed exoplanet · Neptune Like

GJ 436 b

Orbiting GJ 436

Discovered in 2004 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 436 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,004
Method: Radial Velocity
Radius: 4.17 R⊕
Mass: 22.1 M⊕
Orbit: 2.643883 days
Distance: 9.75321 pc

Planet profile

Orbit and physical properties

Orbital period: 2.643883 days
Semi-major axis: 0.0291 AU
Eccentricity: 0.13827
Radius: 4.17 Earth radii
Mass: 22.1 Earth masses
Mass provenance: Mass
Density: 1.8 g/cm³
Equilibrium temperature: 686 K
Insolation: 29.4322 Earth flux

Host system

Star and system properties

Host star: GJ 436
Stars in system: 1
Known planets in system: 1
Spectral type: M2.5 V
Stellar temperature: 3,586.11 K
Stellar radius: 0.455 R☉
Stellar mass: 0.47 M☉
Stellar metallicity: 0.0991 dex
Stellar age: 6 Gyr
Distance: 9.75321 parsecs
Right ascension: 11h42m12.13s
Declination: +26d42m11.04s

Discovery

Detection and provenance

Discovery method: Radial Velocity
Discovery year: 2,004
Publication date: 2004-12
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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