Kepler-51 b
A confirmed exoplanet orbiting Kepler-51.
Compared with Earth
- Size
- About 7.1 times Earth's width.
- Mass
- About 2.1 times Earth's mass.
- Temperature
- About 270 °C (518 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 45 Earth days.
Planet
- Radius
- 7.1 × Earth
- Mass
- 2.1 × Earth
- Density
- 0.03 g/cm³
- Equilibrium temperature
- 543 K
- Starlight received
- Unknown
- Orbital period
- 45.15 days
- Average distance from its star
- 0.2514 AU
Star
- Host star
- Kepler-51
- Spectral class
- F — yellow-white
- Surface temperature
- 6,018 K
- Radius
- 0.94 × Sun
- Mass
- 1.04 × Sun
- Age
- 0.3 billion years
System
- Distance from Earth
- 2,557 light-years (783.8 parsecs)
- Stars in system
- 1
- Known planets
- 4
Discovery
- Year
- 2012
- Method
- Transit
- Facility
- Kepler
Data from the NASA Exoplanet Archive, synced October 14, 2026.