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GJ 3998 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/GJ 3998 b

Confirmed exoplanet · Terrestrial

GJ 3998 b

Orbiting GJ 3998

Discovered in 2016 using Radial Velocity. This page reflects the latest synchronized NASA Exoplanet Archive composite record.

NASA Archive record ↗Back to catalog →

Generic terrestrial catalog artwork; not a direct image of GJ 3998 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,016
Method: Radial Velocity
Radius: 1.39 R⊕
Mass: 2.5 M⊕
Orbit: 2.65033 days
Distance: 18.1459 pc

Planet profile

Orbit and physical properties

Orbital period: 2.65033 days
Semi-major axis: 0.03 AU
Eccentricity: 0
Radius: 1.39 Earth radii
Mass: 2.5 Earth masses
Mass provenance: Msini
Density: 5.12 g/cm³
Equilibrium temperature: 733.5 K
Insolation: 48 Earth flux

Host system

Star and system properties

Host star: GJ 3998
Stars in system: 1
Known planets in system: 3
Spectral type: M1
Stellar temperature: 3,726 K
Stellar radius: 0.5 R☉
Stellar mass: 0.52 M☉
Stellar metallicity: -0.13 dex
Stellar age: 8.38 Gyr
Distance: 18.1459 parsecs
Right ascension: 17h16m00.49s
Declination: +11d03m22.23s

Discovery

Detection and provenance

Discovery method: Radial Velocity
Discovery year: 2,016
Publication date: 2016-10
Discovery locale: Ground
Facility: Roque de los Muchachos Observatory
Telescope: 3.58 m Telescopio Nazionale Galileo
Instrument: HARPS-N Spectrograph
NASA Exoplanet Archive: Open composite record ↗

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