K2-9 b
A confirmed exoplanet orbiting K2-9.
Compared with Earth
- Size
- About 2.3 times Earth's width.
- Temperature
- About 41 °C (106 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Starlight
- About 1.4 times the starlight Earth gets from the Sun.
- Year
- A year here lasts about 18 Earth days.
Planet
- Radius
- 2.25 × Earth
- Mass
- Unknown
- Density
- Unknown
- Equilibrium temperature
- 314 K
- Starlight received
- 1.36 × Earth
- Orbital period
- 18.45 days
- Average distance from its star
- 0.091 AU
Star
- Host star
- K2-9
- Spectral class
- M — red dwarf
- Surface temperature
- 3,390 K
- Radius
- 0.31 × Sun
- Mass
- 0.3 × Sun
- Age
- 1 billion years
System
- Distance from Earth
- 270.6 light-years (82.96 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2015
- Method
- Transit
- Facility
- K2
Data from the NASA Exoplanet Archive, synced October 14, 2026.