Terrestrial planet · Gliese 12

Gliese 12 b

ExoplanetsDiscovered 2024

Scientific overview

Gliese 12 b is a terrestrial planet orbiting Gliese 12, completing an orbit every 13 days, about 40 light-years from Earth. It was discovered in 2024 using the transit method.

Host star

Gliese 12

Spectral type

M4 V

Temperature

3,328 K

Mass

0.255 M☉

Discovery and detection

Detection method

Transit Method

Discovery year

2024

Discovered at

TESS

Knowledge connections

OrbitsGliese 12
Discovered by methodTransit Method
Discovered by missionTESS
Catalogued inNASA Exoplanet Archive

Quick facts

Class: Terrestrial planet
Host star: Gliese 12
Discovery method: Transit Method
Discovery year: 2024
Orbital period: 12.7614 d
Semi-major axis: 0.067 AU
Eccentricity: 0.24
Radius: 0.93 R⊕
Mass: 0.95 M⊕
Density: 6.51 g/cm³ · derived
Equilibrium temp.: 315 K
Insolation: 1.62 S⊕
Distance: 40 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 density6.51 g/cm³derived
Formula & inputs
Formula: ρ = M / (4⁄3·π·r³) (v1.0.0, impl v1.0.0)
Inputs:
- massEarth = 0.95 M⊕ · NASA
- radiusEarth = 0.93 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.