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GJ 3998 d | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/GJ 3998 d

Confirmed exoplanet · Super Earth

GJ 3998 d

Orbiting GJ 3998

Discovered in 2025 using Radial Velocity. This page reflects the latest synchronized NASA Exoplanet Archive composite record.

NASA Archive record ↗Back to catalog →

Generic super earth catalog artwork; not a direct image of GJ 3998 d — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,025
Method: Radial Velocity
Radius: 2.34 R⊕
Mass: 6.07 M⊕
Orbit: 41.78 days
Distance: 18.1459 pc

Planet profile

Orbit and physical properties

Orbital period: 41.78 days
Semi-major axis: 0.189 AU
Eccentricity: 0
Radius: 2.34 Earth radii
Mass: 6.07 Earth masses
Mass provenance: Msini
Density: 2.6 g/cm³
Equilibrium temperature: 292.23 K
Insolation: 1.2 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: 2,025
Publication date: 2025-03
Discovery locale: Ground
Facility: Multiple Observatories
Telescope: Multiple Telescopes
Instrument: Multiple Instruments
NASA Exoplanet Archive: Open composite record ↗

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