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GJ 3378 b | Exoplanets | Apex Andromeda | Apex Andromeda

Planets/Exoplanets/GJ 3378 b

Confirmed exoplanet · Terrestrial

GJ 3378 b

Orbiting GJ 3378

Discovered in 2026 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 3378 b — Generic category artwork—not a direct imageApex Andromeda catalog artwork

Discovery: 2,026
Method: Radial Velocity
Radius: 1.32 R⊕
Mass: 2.3 M⊕
Orbit: 21.45 days
Distance: 7.72274 pc

Planet profile

Orbit and physical properties

Orbital period: 21.45 days
Semi-major axis: 0.09673 AU
Eccentricity: 0
Radius: 1.32 Earth radii
Mass: 2.3 Earth masses
Mass provenance: Msini
Density: 5.5 g/cm³
Equilibrium temperature: 272 K
Insolation: 0.91 Earth flux

Host system

Star and system properties

Host star: GJ 3378
Stars in system: 1
Known planets in system: 1
Spectral type: M4 V
Stellar temperature: 3,340 K
Stellar radius: 0.275 R☉
Stellar mass: 0.262 M☉
Stellar metallicity: -0.09 dex
Stellar age: Not reported by the NASA Exoplanet Archive
Distance: 7.72274 parsecs
Right ascension: 06h01m10.83s
Declination: +59d35m35.49s

Discovery

Detection and provenance

Discovery method: Radial Velocity
Discovery year: 2,026
Publication date: 2026-07
Discovery locale: Ground
Facility: Mauna Kea Observatory
Telescope: 3.58 m Canada-France-Hawaii Telescope (CFHT)
Instrument: SPIRou
NASA Exoplanet Archive: Open composite record ↗

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