GJ 3021 is 57.3 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this G6 V star; the first was found in 2000 by radial velocity (La Silla Observatory).
Fly there in 3DGJ 3021 b takes 133.7 days to go round its star once.
GJ 3021 is one of 2 stars in its system: the other is drawn where the Washington Double Star Catalog measures it on the sky.
| Spectral type | G6 V |
| Surface temperature | 5,540 K |
| Mass | 0.9 solar masses |
| Radius | 0.9 solar radii |
| Luminosity | 0.6607 times the Sun |
| Apparent magnitude | 6.59 |
| Age | about 0.37 billion years |
| Distance from the Sun | 57.3 light-years (17.6 parsecs) |
| Position (J2000) | RA 4.0634°, Dec -79.8514° |
| Constellation | Hydrus |
GJ 3021 B is a M4V star of magnitude 14.5, moving through space with it. In 2016 it was 4″ from GJ 3021, at position angle 352° (Washington Double Star Catalog, 00162-7951 CVN 14): 70.2 AU on the sky at this distance. The true distance can only be larger.
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| GJ 3021 b | 133.7 days | 0.490 AU | 13.1 R⊕ estimated | 1071 M⊕ minimum | Radial Velocity, 2000 |
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 5,540 K, 0.66 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.78 to 1.39 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 57 years ago, within living memory.