Kepler-166 is 1,969 light-years from the Sun. The NASA Exoplanet Archive lists 3 planets around this 5,413 K star; the first was found in 2014 by transit (Kepler).
Fly there in 3DKepler-166 d goes round its star every 37.3 hours, 57 times as often as Mercury goes round the Sun.
| Surface temperature | 5,413 K |
| Mass | 0.811 solar masses |
| Radius | 0.742 solar radii |
| Luminosity | 0.412 times the Sun |
| Apparent magnitude | 14.857 |
| Age | about 5.01 billion years |
| Distance from the Sun | 1968.5 light-years (603.5 parsecs) |
| Position (J2000) | RA 293.1601°, Dec 48.8812° |
| Constellation | Cygnus |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| Kepler-166 d | 37.3 hours | 0.0245 AU | 1.73 R⊕ | 3.64 M⊕ estimated | Transit, 2016 |
| Kepler-166 b | 7.65 days | 0.0720 AU | 2.27 R⊕ | 5.77 M⊕ estimated | Transit, 2014 |
| Kepler-166 c | 34.3 days | 0.195 AU | 2.38 R⊕ | 6.26 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.