Super-Earth · HN Lib

HN Lib b

ExoplanetsDiscovered 2023

Scientific overview

HN Lib b is a super-earth orbiting HN Lib, completing an orbit every 36 days, about 20 light-years from Earth. It was discovered in 2023 using the radial velocity method.

Host star

HN Lib

Spectral type

M4.0 V

Temperature

3,347 K

Mass

0.291 M☉

Discovery and detection

Detection method

Radial Velocity Method

Discovery year

2023

Knowledge connections

OrbitsHN Lib
Discovered by methodRadial Velocity Method
Catalogued inNASA Exoplanet Archive

Quick facts

Class: Super-Earth
Host star: HN Lib
Discovery method: Radial Velocity Method
Discovery year: 2023
Orbital period: 36.116 d
Semi-major axis: 0.1417 AU
Eccentricity: 0.079
Radius: 2.2 R⊕
Mass: 5.46 M⊕
Density: 2.83 g/cm³ · derived
Equilibrium temp.: 234 K
Insolation: 0.5 S⊕
Distance: 20 ly

Density is derived from the archive mass and radius via ρ = M / (4⁄3·π·r³); all other values are catalogued measurements.

Derived values

Computed from source-backed inputs via standard formulae — not observations. Every input and constant is traced below.

Bulk density2.83 g/cm³derived
Formula & inputs
Formula: ρ = M / (4⁄3·π·r³) (v1.0.0, impl v1.0.0)
Inputs:
- massEarth = 5.46 M⊕ · NASA
- radiusEarth = 2.2 R⊕ · NASA
Assumptions: M⊕ = 5.972e+24 kg, R⊕ = 6371000 m (IAU 2015 B3 nominal); Assumes a uniform sphere.
Limitations: Withheld above 30 g/cm³ (inconsistent mass/radius inputs).; Archive mass/radius carry no propagated uncertainty here.
Uncertainty: not propagated (inputs carry no catalogued uncertainty)
Computed as of 2026-06-29.

Quality & authority

Partial

Unreviewed

Description: Complete
Source coverage: Partial
Relationship coverage: Complete
Review coverage: None
Citation coverage: None
Image coverage: Not applicable

Data from the NASA Exoplanet Archive. See source quality.