Exoplanet · mini-Neptune
Kepler-51 e
Kepler-51 e is a mini-Neptune orbiting the star Kepler-51. Its year lasts 264 Earth days. It was discovered in 2024 by the Transit Timing Variations method.
| Host star | Kepler-51 |
|---|---|
| Distance | 2,557 light-years (783.8 pc) |
| Orbital period | 264 days |
| Eccentricity | 0.020 |
| Radius | 2.18 R⊕ · 0.194 R♃ |
| Mass | 5.4 M⊕ · 0.017 M♃ |
| Density | 2.86 g/cm³ |
| Surface gravity | 1.14 × Earth |
| Discovery method | Transit Timing Variations |
| Discovery year | 2024 |
| Discovered by | Multiple Observatories |
In the sky
A telescope is needed to see it: its apparent magnitude is 14.89. Visible from the whole Northern Hemisphere and south to latitude 40° S. North of latitude 40° N it never sets. It stands highest at midnight in July, the best time to observe it.
Light's journey
The light you see tonight set out around 532 BC. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 45 million years.
Planets in the same system
- Kepler-51 b 45.2-day orbit · 7.1 R⊕
- Kepler-51 c 85.3-day orbit · 9 R⊕
- Kepler-51 d 130-day orbit · 9.7 R⊕
Data: NASA Exoplanet Archive, PSCompPars. Its look in the simulation is a rendering based on the measured radius, mass and temperature.