Terrestrial planet · GJ 3378

GJ 3378 b

ExoplanetsDiscovered 2026

Scientific overview

GJ 3378 b is a terrestrial planet orbiting GJ 3378, completing an orbit every 21 days, about 25 light-years from Earth. It was discovered in 2026 using the radial velocity method.

Host star

GJ 3378

Spectral type

M4 V

Temperature

3,340 K

Mass

0.262 M☉

Discovery and detection

Detection method

Radial Velocity Method

Discovery year

2026

Knowledge connections

OrbitsGJ 3378
Discovered by methodRadial Velocity Method
Catalogued inNASA Exoplanet Archive

Quick facts

Class: Terrestrial planet
Host star: GJ 3378
Discovery method: Radial Velocity Method
Discovery year: 2026
Orbital period: 21.45 d
Semi-major axis: 0.0967 AU
Eccentricity: 0
Radius: 1.32 R⊕
Mass: 2.3 M⊕
Density: 5.51 g/cm³ · derived
Equilibrium temp.: 272 K
Insolation: 0.91 S⊕
Distance: 25 ly

Density is derived from the archive mass and radius via ρ = M / (4⁄3·π·r³); all other values are catalogued measurements.

Derived values

Computed from source-backed inputs via standard formulae — not observations. Every input and constant is traced below.

Bulk density5.51 g/cm³derived
Formula & inputs
Formula: ρ = M / (4⁄3·π·r³) (v1.0.0, impl v1.0.0)
Inputs:
- massEarth = 2.3 M⊕ · NASA
- radiusEarth = 1.32 R⊕ · NASA
Assumptions: M⊕ = 5.972e+24 kg, R⊕ = 6371000 m (IAU 2015 B3 nominal); Assumes a uniform sphere.
Limitations: Withheld above 30 g/cm³ (inconsistent mass/radius inputs).; Archive mass/radius carry no propagated uncertainty here.
Uncertainty: not propagated (inputs carry no catalogued uncertainty)
Computed as of 2026-06-29.

Quality & authority

Partial

Unreviewed

Description: Complete
Source coverage: Partial
Relationship coverage: Complete
Review coverage: None
Citation coverage: None
Image coverage: Not applicable

Data from the NASA Exoplanet Archive. See source quality.