K2-129 is 90.7 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this 3,459 K star; the first was found in 2017 by transit (K2).
Fly there in 3DK2-129 b goes round its star every 8.24 days, 11 times as often as Mercury goes round the Sun.
| Surface temperature | 3,459 K |
| Mass | 0.360031 solar masses |
| Radius | 0.36001 solar radii |
| Luminosity | 0.01484 times the Sun |
| Apparent magnitude | 13.639 |
| Distance from the Sun | 90.7 light-years (27.8 parsecs) |
| Position (J2000) | RA 289.1485°, Dec -25.6463° |
| Constellation | Sagittarius |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| K2-129 b | 8.24 days | 0.0570 AU | 1.04 R⊕ | 1.12 M⊕ estimated | Transit, 2017 |
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 3,459 K, 0.015 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 91 years ago, within living memory.