K2-55 is 520 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this 4,300 K star; the first was found in 2016 by transit (K2).
Fly there in 3DK2-55 b goes round its star every 2.85 days, 31 times as often as Mercury goes round the Sun.
| Surface temperature | 4,300 K |
| Mass | 0.688 solar masses |
| Radius | 0.715 solar radii |
| Luminosity | 0.1643 times the Sun |
| Apparent magnitude | 13.519 |
| Distance from the Sun | 520.3 light-years (159.5 parsecs) |
| Position (J2000) | RA 333.7519°, Dec -17.2508° |
| Constellation | Aquarius |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| K2-55 b | 2.85 days | 0.0349 AU | 4.43 R⊕ | 44 M⊕ | 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 4,300 K, 0.16 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.41 to 0.77 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 520 years ago, around 1510.