Kepler-398 is 578 light-years from the Sun. The NASA Exoplanet Archive lists 3 planets around this 4,493 K star; the first was found in 2014 by transit (Kepler).
Fly there in 3DKepler-398 b goes round its star every 4.08 days, 22 times as often as Mercury goes round the Sun.
| Surface temperature | 4,493 K |
| Mass | 0.649 solar masses |
| Radius | 0.613 solar radii |
| Luminosity | 0.1545 times the Sun |
| Apparent magnitude | 13.499 |
| Age | about 2.34 billion years |
| Distance from the Sun | 578.5 light-years (177.4 parsecs) |
| Position (J2000) | RA 291.4689°, Dec 40.3437° |
| Constellation | Lyra |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| Kepler-398 b | 4.08 days | 0.0440 AU | 0.93 R⊕ | 0.749 M⊕ estimated | Transit, 2014 |
| Kepler-398 d | 6.83 days | 0.0618 AU | 0.88 R⊕ | 0.615 M⊕ estimated | Transit, 2016 |
| Kepler-398 c | 11.4 days | 0.0870 AU | 1.01 R⊕ | 1.01 M⊕ estimated | Transit, 2014 |
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 4,493 K, 0.15 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.40 to 0.74 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 578 years ago, around 1450.