Gliese 12 is 39.8 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this M4 V star; the first was found in 2024 by transit (Transiting Exoplanet Survey Satellite (TESS)).
Fly there in 3DGliese 12 b goes round its star every 12.8 days, 7 times as often as Mercury goes round the Sun.
| Spectral type | M4 V |
| Surface temperature | 3,328 K |
| Mass | 0.255 solar masses |
| Radius | 0.265 solar radii |
| Luminosity | 0.00728 times the Sun |
| Apparent magnitude | 12.6 |
| Age | about 7 billion years |
| Distance from the Sun | 39.8 light-years (12.2 parsecs) |
| Position (J2000) | RA 3.9579°, Dec 13.5576° |
| Constellation | Pisces |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| Gliese 12 b | 12.8 days | 0.0670 AU | 0.93 R⊕ | 0.95 M⊕ | Transit, 2024 |
Values are the NASA Exoplanet Archive’s composite parameters. A radius marked estimated comes from a mass–radius relation; a mass marked minimum is M sin i. Planet sizes and colours in the 3D view are renderings: none of these worlds has been photographed as more than a point of light.
For a star of 3,328 K, 0.0073 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.089 to 0.17 AU. None of its known planets orbits inside it. The zone says how much starlight arrives, not whether a planet has water or air. The edges follow Kopparapu et al. (2014), as the 3D view draws them.
The light you see left 40 years ago, within living memory.