GJ 317 is 49.6 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this M3.5 V star; the first was found in 2007 by radial velocity (W. M. Keck Observatory).
Fly there in 3DGJ 317 c takes 17.8 years to go round its star once.
| Spectral type | M3.5 V |
| Surface temperature | 3,496 K |
| Mass | 0.402 solar masses |
| Radius | 0.403 solar radii |
| Luminosity | 0.02058 times the Sun |
| Apparent magnitude | 12.4 |
| Age | about 5 billion years |
| Distance from the Sun | 49.6 light-years (15.2 parsecs) |
| Position (J2000) | RA 130.2445°, Dec -23.4528° |
| Constellation | Pyxis |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| GJ 317 b | 695.7 days | 1.138 AU | 13.3 R⊕ estimated | 794.5 M⊕ | Radial Velocity, 2007 |
| GJ 317 c | 17.8 years | 5.040 AU | 13.6 R⊕ estimated | 454.49 M⊕ minimum | Radial Velocity, 2016 |
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 3,496 K, 0.021 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.15 to 0.29 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 50 years ago, within living memory.