NASA (Exoplanet Catalog artwork)Gliese 12 b
A temperate Earth-to-Venus-sized world 40 light-years away
Overview
Gliese 12 b is a terrestrial exoplanet that orbits a M-type star. Its mass is 0.95 Earths, it takes 12.8 days to complete one orbit of its star, and is 0.067 AU from its star. Its discovery was announced in 2024.
Source: NASA Exoplanet Catalog
Why it matters
- Announced in 2024 from TESS data, with an estimated equilibrium temperature of about 42 °C.
- Orbits a quiet red dwarf every 12.8 days — ideal for JWST atmospheric follow-up.
- Could tell us whether such planets end up like Earth or like Venus.
Discovery & system
- Discovered
- 2024 · Transit · Transiting Exoplanet Survey Satellite (TESS)
- Discovery paper
- Kuzuhara et al. 2024
- Host star
- Gliese 12 · M4 V · 3,328 K · 0.26 M☉
- System
- 1 known planet
The system
| World | Period | Distance | Radius | Mass | Temp. |
|---|---|---|---|---|---|
| Gliese 12 b | 12.8 d | 0.067 AU | 0.93 R⊕ | 0.95 M⊕ | 315 K |
this worldhabitable zone 0.081 AU – 0.142 AUlog distance scaleorbital phases are arbitrarystar: M4 V, 3,328 K
By the numbers
- Radius
- 0.93 R⊕5,925 km
- Mass
- 0.95 M⊕5.67 ×10²⁴ kg
- Orbital period
- 12.8 d0.03 yr
- Distance from star
- 0.067 AU10.02 million km
- Eccentricity
- 0.24elliptical
- Equilibrium temp.
- 315 K41 °C
- Starlight received
- 2 × Earth
- Distance from Earth
- 39.8 ly12.2 pc
- Density
- 6.4 g/cm³1.16 × Earth
Sources
Image: NASA (Exoplanet Catalog artwork) · NASA media: generally free of copyright · image page
Text: NASA Exoplanet Catalog. Taglines and highlights are editorial.