Kepler-309 is 1,776 light-years from the Sun. The NASA Exoplanet Archive lists 2 planets around this M0 V star; the first was found in 2014 by transit (Kepler).
Fly there in 3DKepler-309 b goes round its star every 5.92 days, 15 times as often as Mercury goes round the Sun.
| Spectral type | M0 V |
| Surface temperature | 4,713 K |
| Mass | 0.816 solar masses |
| Radius | 0.721 solar radii |
| Luminosity | 0.2667 times the Sun |
| Apparent magnitude | 15.418 |
| Age | about 3.02 billion years |
| Distance from the Sun | 1776.1 light-years (544.6 parsecs) |
| Position (J2000) | RA 297.5099°, Dec 46.9614° |
| Constellation | Cygnus |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| Kepler-309 b | 5.92 days | 0.0590 AU | 1.56 R⊕ | 3.05 M⊕ estimated | Transit, 2014 |
| Kepler-309 c | 105.4 days | 0.401 AU | 2.51 R⊕ | 6.85 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 4,713 K, 0.27 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.52 to 0.95 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 1,776 years ago, around AD 250.