Kepler-9 is 2,049 light-years from the Sun. The NASA Exoplanet Archive lists 3 planets around this 5,774 K star; the first was found in 2010 by transit (Kepler).
Fly there in 3DKepler-9 d goes round its star every 38.2 hours, 55 times as often as Mercury goes round the Sun.
| Surface temperature | 5,774 K |
| Mass | 1.022 solar masses |
| Radius | 0.958 solar radii |
| Luminosity | 0.9162 times the Sun |
| Apparent magnitude | 13.922 |
| Age | about 2 billion years |
| Distance from the Sun | 2049.1 light-years (628.3 parsecs) |
| Position (J2000) | RA 285.5740°, Dec 38.4008° |
| Constellation | Lyra |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| Kepler-9 d | 38.2 hours | 0.0273 AU | 1.64 R⊕ | 8.4147 M⊕ minimum | Transit, 2010 |
| Kepler-9 b | 19.2 days | 0.143 AU | 8.29 R⊕ | 43.4 M⊕ | Transit, 2010 |
| Kepler-9 c | 39.0 days | 0.227 AU | 8.08 R⊕ | 29.9 M⊕ | Transit, 2010 |
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.