HD 1397 b
A confirmed exoplanet orbiting HD 1397.
Compared with Earth
- Size
- About 12 times Earth's width.
- Mass
- About 132 times Earth's mass.
- Temperature
- About 955 °C (1,751 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Starlight
- About 356 times the starlight Earth gets from the Sun.
- Year
- A year here lasts about 12 Earth days.
Planet
- Radius
- 11.5 × Earth
- Mass
- 131.9 × Earth
- Density
- 0.477 g/cm³
- Equilibrium temperature
- 1,228 K
- Starlight received
- 356 × Earth
- Orbital period
- 11.54 days
- Average distance from its star
- 0.1097 AU
Star
- Host star
- HD 1397
- Spectral class
- G — sun-like
- Surface temperature
- 5,521 K
- Radius
- 2.336 × Sun
- Mass
- 1.324 × Sun
- Age
- 4.51 billion years
System
- Distance from Earth
- 259.5 light-years (79.57 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.