Kepler-4 b
A confirmed exoplanet orbiting Kepler-4.
Compared with Earth
- Size
- About 4 times Earth's width.
- Mass
- About 24 times Earth's mass.
- Temperature
- About 1,377 °C (2,510 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 3.2 Earth days.
Planet
- Radius
- 4.002 × Earth
- Mass
- 24.47 × Earth
- Density
- 1.91 g/cm³
- Equilibrium temperature
- 1,650 K
- Starlight received
- Unknown
- Orbital period
- 3.213 days
- Average distance from its star
- 0.0456 AU
Star
- Host star
- Kepler-4
- Spectral class
- G — sun-like
- Surface temperature
- 5,857 K
- Radius
- 1.487 × Sun
- Mass
- 1.223 × Sun
- Age
- 4.5 billion years
System
- Distance from Earth
- 1,591 light-years (487.9 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2009
- Method
- Transit
- Facility
- Kepler
Data from the NASA Exoplanet Archive, synced October 14, 2026.