HD 219666 b
A confirmed exoplanet orbiting HD 219666.
Compared with Earth
- Size
- About 4.9 times Earth's width.
- Mass
- About 18 times Earth's mass.
- Temperature
- About 803 °C (1,477 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Year
- A year here lasts about 6 Earth days.
Planet
- Radius
- 4.898 × Earth
- Mass
- 17.6 × Earth
- Density
- Unknown
- Equilibrium temperature
- 1,076 K
- Starlight received
- Unknown
- Orbital period
- 6.034 days
- Average distance from its star
- Unknown
Star
- Host star
- HD 219666
- Spectral class
- G — sun-like
- Surface temperature
- 5,540 K
- Radius
- 1.059 × Sun
- Mass
- 1.02 × Sun
- Age
- Unknown
System
- Distance from Earth
- 307.1 light-years (94.17 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2018
- Method
- Transit
- Facility
- Transiting Exoplanet Survey Satellite (TESS)
Data from the NASA Exoplanet Archive, synced October 14, 2026.