Kepler-51 is 2,557 light-years from the Sun. The NASA Exoplanet Archive lists 4 planets around this 6,018 K star; the first was found in 2012 by transit (Kepler).
Fly there in 3DKepler-51 b goes round its star every 45.2 days, 1.9 times as often as Mercury goes round the Sun.
Where the archive gives only a period or only an orbit size, the other is worked out from Kepler’s third law with the star’s mass.
| Surface temperature | 6,018 K |
| Mass | 1.04 solar masses |
| Radius | 0.94 solar radii |
| Luminosity | 0.7216 times the Sun |
| Apparent magnitude | 14.885 |
| Age | about 0.3 billion years |
| Distance from the Sun | 2556.5 light-years (783.8 parsecs) |
| Position (J2000) | RA 296.4798°, Dec 49.9376° |
| Constellation | Cygnus |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| Kepler-51 b | 45.2 days | 0.251 AU | 7.1 R⊕ | 2.1 M⊕ | Transit, 2012 |
| Kepler-51 e | 264.3 days | 0.817 AU from Kepler’s law | 2.18 R⊕ estimated | 5.4 M⊕ | Transit Timing Variations, 2024 |
| Kepler-51 c | 85.3 days | 0.384 AU | 9 R⊕ | 4 M⊕ | Transit, 2012 |
| Kepler-51 d | 130.2 days | 0.509 AU | 9.7 R⊕ | 7.6 M⊕ | 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.