Kepler-421 b
A confirmed exoplanet orbiting Kepler-421.
Compared with Earth
- Size
- About 4.2 times Earth's width.
- Temperature
- About -88 °C (-127 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 1.9 Earth years.
Planet
- Radius
- 4.16 × Earth
- Mass
- Unknown
- Density
- Unknown
- Equilibrium temperature
- 185 K
- Starlight received
- Unknown
- Orbital period
- 704.2 days
- Average distance from its star
- 1.219 AU
Star
- Host star
- Kepler-421
- Spectral class
- G — sun-like
- Surface temperature
- 5,308 K
- Radius
- 0.757 × Sun
- Mass
- 0.794 × Sun
- Age
- 4 billion years
System
- Distance from Earth
- 1,137 light-years (348.6 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2014
- Method
- Transit
- Facility
- Kepler
Data from the NASA Exoplanet Archive, synced October 14, 2026.