K2-43 is 595 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this 3,841 K star; the first was found in 2016 by transit (K2).
Fly there in 3DK2-43 c goes round its star every 2.20 days, 40 times as often as Mercury goes round the Sun.
Where the archive gives only a period or only an orbit size, the other is worked out from Kepler’s third law with the star’s mass.
| Surface temperature | 3,841 K |
| Mass | 0.571 solar masses |
| Radius | 0.542 solar radii |
| Luminosity | 0.06132 times the Sun |
| Apparent magnitude | 15.748 |
| Distance from the Sun | 595.4 light-years (182.5 parsecs) |
| Position (J2000) | RA 169.1170°, Dec -3.9754° |
| Constellation | Leo |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| K2-43 c | 2.20 days | 0.0274 AU from Kepler’s law | 2.42 R⊕ | 6.44 M⊕ estimated | Transit, 2019 |
| K2-43 b | 3.47 days | 0.0378 AU | 4.51 R⊕ | 18.5 M⊕ estimated | Transit, 2016 |
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 3,841 K, 0.061 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.26 to 0.49 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 595 years ago, around 1430.