Kepler-9 d
A confirmed exoplanet orbiting Kepler-9.
Compared with Earth
- Size
- About 1.6 times Earth's width.
- Temperature
- About 1,753 °C (3,187 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 1.6 Earth days.
Planet
- Radius
- 1.64 × Earth
- Mass
- Unknown
- Density
- Unknown
- Equilibrium temperature
- 2,026 K
- Starlight received
- Unknown
- Orbital period
- 1.593 days
- Average distance from its star
- 0.0273 AU
Star
- Host star
- Kepler-9
- Spectral class
- G — sun-like
- Surface temperature
- 5,777 K
- Radius
- 1.02 × Sun
- Mass
- 1.07 × Sun
- Age
- 1 billion years
System
- Distance from Earth
- 2,049 light-years (628.3 parsecs)
- Stars in system
- 1
- Known planets
- 3
Discovery
- Year
- 2010
- Method
- Transit
- Facility
- Kepler
Data from the NASA Exoplanet Archive, synced October 14, 2026.