K2-240 is 238 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this M0.5 V star; the first was found in 2018 by transit (K2).
Fly there in 3DK2-240 b goes round its star every 6.03 days, 15 times as often as Mercury goes round the Sun.
| Spectral type | M0.5 V |
| Surface temperature | 3,810 K |
| Mass | 0.58 solar masses |
| Radius | 0.54 solar radii |
| Luminosity | 0.053 times the Sun |
| Apparent magnitude | 13.372 |
| Distance from the Sun | 237.8 light-years (72.9 parsecs) |
| Position (J2000) | RA 227.8494°, Dec -17.8754° |
| Constellation | Libra |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| K2-240 b | 6.03 days | 0.0513 AU | 2 R⊕ | 4.66 M⊕ estimated | Transit, 2018 |
| K2-240 c | 20.5 days | 0.116 AU | 1.8 R⊕ | 3.89 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 3,810 K, 0.053 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.24 to 0.45 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 238 years ago, around 1790.