K2-17 b
A confirmed exoplanet orbiting K2-17.
Compared with Earth
- Size
- About 2.2 times Earth's width.
- Temperature
- About 214 °C (417 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 18 Earth days.
Planet
- Radius
- 2.23 × Earth
- Mass
- Unknown
- Density
- Unknown
- Equilibrium temperature
- 487 K
- Starlight received
- Unknown
- Orbital period
- 17.97 days
- Average distance from its star
- 0.119 AU
Star
- Host star
- K2-17
- Spectral class
- K — orange dwarf
- Surface temperature
- 4,320 K
- Radius
- 0.66 × Sun
- Mass
- 0.71 × Sun
- Age
- Unknown
System
- Distance from Earth
- 408 light-years (125.1 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.