HN Lib b
A confirmed exoplanet orbiting HN Lib.
Compared with Earth
- Mass
- About 5.5 times Earth's mass.
- Temperature
- About -39 °C (-38 °F) from starlight alone, against -18 °C (-1 °F) for Earth measured the same way.
- Starlight
- About 50% of the starlight Earth gets from the Sun.
- Year
- A year here lasts about 36 Earth days.
Planet
- Radius
- Unknown
- Mass
- 5.46 × Earth
- Density
- Unknown
- Equilibrium temperature
- 234.4 K
- Starlight received
- 0.503 × Earth
- Orbital period
- 36.12 days
- Average distance from its star
- 0.1417 AU
Star
- Host star
- HN Lib
- Spectral class
- M — red dwarf
- Surface temperature
- 3,347 K
- Radius
- 0.299 × Sun
- Mass
- 0.291 × Sun
- Age
- 4.4 billion years
System
- Distance from Earth
- 20.37 light-years (6.244 parsecs)
- Stars in system
- 1
- Known planets
- 1
Discovery
- Year
- 2023
- Method
- Radial Velocity
- Facility
- Calar Alto Observatory
Data from the NASA Exoplanet Archive, synced October 14, 2026.