K2-188 is 1,457 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this 5,977 K star; the first was found in 2018 by transit (K2).
Fly there in 3DK2-188 b goes round its star every 41.8 hours, 51 times as often as Mercury goes round the Sun.
| Surface temperature | 5,977 K |
| Mass | 1.06 solar masses |
| Radius | 1.19 solar radii |
| Luminosity | 1.625 times the Sun |
| Apparent magnitude | 12.657 |
| Distance from the Sun | 1457.3 light-years (446.8 parsecs) |
| Position (J2000) | RA 129.8137°, Dec 23.3574° |
| Constellation | Cancer |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| K2-188 b | 41.8 hours | 0.0289 AU | 1.35 R⊕ | 2.39 M⊕ estimated | Transit, 2018 |
| K2-188 c | 7.81 days | 0.0785 AU | 2.83 R⊕ | 8.4 M⊕ estimated | Transit, 2018 |
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 5,977 K, 1.6 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 1.20 to 2.10 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 1,457 years ago, around AD 570.