Kapteyn is 12.8 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this M2.0V star; the first was found in 2014 by radial velocity (Multiple Observatories).
Fly there in 3DKapteyn c takes 121.5 days to go round its star once.
| Spectral type | M2.0V |
| Surface temperature | 3,550 K |
| Mass | 0.281 solar masses |
| Radius | 0.291 solar radii |
| Luminosity | 0.01611 times the Sun |
| Apparent magnitude | 8.86 |
| Distance from the Sun | 12.8 light-years (3.9 parsecs) |
| Position (J2000) | RA 77.9587°, Dec -45.0430° |
| Constellation | Pictor |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| Kapteyn c disputed | 121.5 days | 0.311 AU | 2.54 R⊕ estimated | 7 M⊕ minimum | Radial Velocity, 2014 |
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 3,550 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. 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 13 years ago, within living memory.