HD 17156 b
A confirmed exoplanet orbiting HD 17156.
Compared with Earth
- Size
- About 12 times Earth's width.
- Mass
- About 1,036 times Earth's mass.
- Temperature
- About 615 °C (1,139 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Starlight
- About 69 times the starlight Earth gets from the Sun.
- Year
- A year here lasts about 21 Earth days.
Planet
- Radius
- 12.26 × Earth
- Mass
- 1,036 × Earth
- Density
- 3.08 g/cm³
- Equilibrium temperature
- 888 K
- Starlight received
- 68.8 × Earth
- Orbital period
- 21.22 days
- Average distance from its star
- 0.1632 AU
Star
- Host star
- HD 17156
- Spectral class
- F — yellow-white
- Surface temperature
- 6,046 K
- Radius
- 1.517 × Sun
- Mass
- 1.285 × Sun
- Age
- 3.3 billion years
System
- Distance from Earth
- 254.7 light-years (78.09 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2007
- Method
- Radial Velocity
- Facility
- Subaru Telescope
Data from the NASA Exoplanet Archive, synced October 14, 2026.