GJ 357 is 30.8 light-years from the Sun. The NASA Exoplanet Archive lists 3 planets around this M2.5 V star; the first was found in 2019 by transit (Transiting Exoplanet Survey Satellite (TESS)).
Fly there in 3DGJ 357 b goes round its star every 3.93 days, 22 times as often as Mercury goes round the Sun.
| Spectral type | M2.5 V |
| Surface temperature | 3,505 K |
| Mass | 0.342 solar masses |
| Radius | 0.337 solar radii |
| Luminosity | 0.01591 times the Sun |
| Apparent magnitude | 10.91 |
| Distance from the Sun | 30.8 light-years (9.4 parsecs) |
| Position (J2000) | RA 144.0075°, Dec -21.6651° |
| Constellation | Hydra |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| GJ 357 b | 3.93 days | 0.0360 AU | 1.2 R⊕ | 1.83 M⊕ | Transit, 2019 |
| GJ 357 c | 9.12 days | 0.0610 AU | 1.66 R⊕ estimated | 3.4 M⊕ minimum | Radial Velocity, 2019 |
| GJ 357 d | 55.7 days | 0.204 AU | 2.34 R⊕ estimated | 6.1 M⊕ minimum | Radial Velocity, 2019 |
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 3,505 K, 0.016 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.13 to 0.25 AU. 1 of its 3 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 31 years ago, within living memory.