K2-291 is 294 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this 5,520 K star; the first was found in 2019 by transit (K2).
Fly there in 3DK2-291 b goes round its star every 2.23 days, 40 times as often as Mercury goes round the Sun.
| Surface temperature | 5,520 K |
| Mass | 0.934 solar masses |
| Radius | 0.899 solar radii |
| Luminosity | 0.682 times the Sun |
| Apparent magnitude | 10.014 |
| Age | about 3.72 billion years |
| Distance from the Sun | 293.7 light-years (90.1 parsecs) |
| Position (J2000) | RA 76.4459°, Dec 21.5482° |
| Constellation | Taurus |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| K2-291 b | 2.23 days | 0.0326 AU | 1.589 R⊕ | 6.49 M⊕ | Transit, 2019 |
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 5,520 K, 0.68 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.80 to 1.42 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 294 years ago, around 1730.