Kepler-391 b
A confirmed exoplanet orbiting Kepler-391.
Compared with Earth
- Size
- About 2.5 times Earth's width.
- Mass
- About 1,100 times Earth's mass.
- Temperature
- About 657 °C (1,214 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Starlight
- About 690 times the starlight Earth gets from the Sun.
- Year
- A year here lasts about 7.4 Earth days.
Planet
- Radius
- 2.5 × Earth
- Mass
- 1,100 × Earth
- Density
- 380 g/cm³
- Equilibrium temperature
- 930 K
- Starlight received
- 690 × Earth
- Orbital period
- 7.418 days
- Average distance from its star
- 0.083 AU
Star
- Host star
- Kepler-391
- Spectral class
- K — orange dwarf
- Surface temperature
- 5,038 K
- Radius
- 2.879 × Sun
- Mass
- 1.27 × Sun
- Age
- 4.365 billion years
System
- Distance from Earth
- 2,835 light-years (869.2 parsecs)
- Stars in system
- 1
- Known planets
- 2
Discovery
- Year
- 2014
- Method
- Transit
- Facility
- Kepler
Data from the NASA Exoplanet Archive, synced October 14, 2026.