K2-198 is 361 light-years from the Sun. The NASA Exoplanet Archive lists 3 planets around this 5,213 K star; the first was found in 2018 by transit (K2).
Fly there in 3DK2-198 c goes round its star every 3.36 days, 26 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 | 5,213 K |
| Mass | 0.799 solar masses |
| Radius | 0.757 solar radii |
| Luminosity | 0.3973 times the Sun |
| Apparent magnitude | 10.971 |
| Distance from the Sun | 360.6 light-years (110.6 parsecs) |
| Position (J2000) | RA 198.8437°, Dec -6.4650° |
| Constellation | Virgo |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| K2-198 c | 3.36 days | 0.0407 AU from Kepler’s law | 1.423 R⊕ | 2.61 M⊕ estimated | Transit, 2019 |
| K2-198 d | 7.45 days | 0.0693 AU from Kepler’s law | 2.438 R⊕ | 6.52 M⊕ estimated | Transit, 2019 |
| K2-198 b | 17.0 days | 0.120 AU from Kepler’s law | 4.189 R⊕ | 16.3 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.