K2-73 is 878 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this 5,867 K star; the first was found in 2016 by transit (K2).
Fly there in 3DK2-73 b goes round its star every 7.50 days, 12 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 | 5,867 K |
| Mass | 1.02 solar masses |
| Radius | 1.058 solar radii |
| Luminosity | 1.191 times the Sun |
| Apparent magnitude | 11.345 |
| Distance from the Sun | 878.0 light-years (269.2 parsecs) |
| Position (J2000) | RA 335.0257°, Dec -9.0561° |
| Constellation | Aquarius |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| K2-73 b | 7.50 days | 0.0762 AU | 2.58 R⊕ | 9.2 M⊕ | Transit, 2016 |
| K2-73 c | 2.7 years | 1.970 AU from Kepler’s law | 13 R⊕ estimated | 1142 M⊕ minimum | Radial Velocity, 2025 |
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 5,867 K, 1.2 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 1.03 to 1.82 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 878 years ago, around 1150.