Kepler-256 is 3,348 light-years from the Sun. The NASA Exoplanet Archive lists 4 planets around this 5,551 K star; the first was found in 2014 by transit (Kepler).
Fly there in 3DKepler-256 b goes round its star every 38.9 hours, 54 times as often as Mercury goes round the Sun.
| Surface temperature | 5,551 K |
| Mass | 1.037 solar masses |
| Radius | 1.301 solar radii |
| Luminosity | 0.8728 times the Sun |
| Apparent magnitude | 15.178 |
| Age | about 1.82 billion years |
| Distance from the Sun | 3347.8 light-years (1026.4 parsecs) |
| Position (J2000) | RA 292.5804°, Dec 46.0974° |
| Constellation | Cygnus |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| Kepler-256 b | 38.9 hours | 0.0270 AU | 1.59 R⊕ | 3.15 M⊕ estimated | Transit, 2014 |
| Kepler-256 c | 3.39 days | 0.0450 AU | 2.15 R⊕ | 5.27 M⊕ estimated | Transit, 2014 |
| Kepler-256 d | 5.84 days | 0.0640 AU | 2.48 R⊕ | 6.71 M⊕ estimated | Transit, 2014 |
| Kepler-256 e | 10.7 days | 0.0960 AU | 2.35 R⊕ | 6.12 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 5,551 K, 0.87 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.90 to 1.60 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 3,348 years ago, around 1300 BC.