GJ 3988 is 32.3 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this M4.5 V star; the first was found in 2023 by radial velocity (Calar Alto Observatory).
Fly there in 3DGJ 3988 b goes round its star every 6.94 days, 13 times as often as Mercury goes round the Sun.
| Spectral type | M4.5 V |
| Surface temperature | 3,273 K |
| Mass | 0.1842 solar masses |
| Radius | 0.19734 solar radii |
| Luminosity | 0.004026 times the Sun |
| Apparent magnitude | 13.627 |
| Distance from the Sun | 32.3 light-years (9.9 parsecs) |
| Position (J2000) | RA 255.8504°, Dec 51.4090° |
| Constellation | Draco |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| GJ 3988 b | 6.94 days | 0.0405 AU | 1.74 R⊕ estimated | 3.69 M⊕ minimum | Radial Velocity, 2023 |
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 3,273 K, 0.0040 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.066 to 0.13 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 32 years ago, within living memory.