Kepler-397 is 3,161 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this 5,307 K star; the first was found in 2014 by transit (Kepler).
Fly there in 3DKepler-397 b goes round its star every 22.3 days, 4 times as often as Mercury goes round the Sun.
| Surface temperature | 5,307 K |
| Mass | 0.844 solar masses |
| Radius | 0.767 solar radii |
| Luminosity | 0.4207 times the Sun |
| Apparent magnitude | 16.357 |
| Age | about 5.25 billion years |
| Distance from the Sun | 3160.5 light-years (969.0 parsecs) |
| Position (J2000) | RA 295.8940°, Dec 42.3805° |
| Constellation | Cygnus |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| Kepler-397 b | 22.3 days | 0.144 AU | 2.46 R⊕ | 6.62 M⊕ estimated | Transit, 2014 |
| Kepler-397 c | 135.5 days | 0.480 AU | 6.18 R⊕ | 31.6 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.