HN Lib is 20.4 light-years from the Sun. The NASA Exoplanet Archive lists 1 planet around this M4.0 V star; the first was found in 2023 by radial velocity (Calar Alto Observatory).
Fly there in 3DHN Lib b goes round its star every 36.1 days, 2.4 times as often as Mercury goes round the Sun.
| Spectral type | M4.0 V |
| Surface temperature | 3,347 K |
| Mass | 0.291 solar masses |
| Radius | 0.299 solar radii |
| Luminosity | 0.01011 times the Sun |
| Apparent magnitude | 11.311 |
| Age | about 4.4 billion years |
| Distance from the Sun | 20.4 light-years (6.2 parsecs) |
| Position (J2000) | RA 218.5685°, Dec -12.5170° |
| Constellation | Libra |
| Planet | Year | Orbit | Radius | Mass | Found |
|---|---|---|---|---|---|
| HN Lib b | 36.1 days | 0.142 AU | 2.2 R⊕ estimated | 5.46 M⊕ minimum | Radial Velocity, 2023 |
Values are the NASA Exoplanet Archive’s composite parameters. A radius marked estimated comes from a mass–radius relation; a mass marked minimum is M sin i. Planet sizes and colours in the 3D view are renderings: none of these worlds has been photographed as more than a point of light.
For a star of 3,347 K, 0.010 times as bright as the Sun, the habitable zone, where starlight could keep water liquid on a rocky surface, runs from about 0.10 to 0.20 AU. Its one known planet orbits inside it. The zone says how much starlight arrives, not whether a planet has water or air. The edges follow Kopparapu et al. (2014), as the 3D view draws them.
The light you see left 20 years ago, within living memory.