HD 191939 d
A confirmed exoplanet orbiting HD 191939.
Compared with Earth
- Size
- About 3 times Earth's width.
- Mass
- About 2.8 times Earth's mass.
- Temperature
- About 267 °C (512 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Starlight
- About 14 times the starlight Earth gets from the Sun.
- Year
- A year here lasts about 38 Earth days.
Planet
- Radius
- 2.995 × Earth
- Mass
- 2.8 × Earth
- Density
- 0.57 g/cm³
- Equilibrium temperature
- 540 K
- Starlight received
- 14.3 × Earth
- Orbital period
- 38.35 days
- Average distance from its star
- 0.2132 AU
Star
- Host star
- HD 191939
- Spectral class
- G — sun-like
- Surface temperature
- 5,348 K
- Radius
- 0.94 × Sun
- Mass
- 0.81 × Sun
- Age
- 8.7 billion years
System
- Distance from Earth
- 174.8 light-years (53.61 parsecs)
- Stars in system
- 1
- Known planets
- 6
Discovery
- Year
- 2020
- Method
- Transit
- Facility
- Transiting Exoplanet Survey Satellite (TESS)
Data from the NASA Exoplanet Archive, synced October 14, 2026.