---
title: "The Liesma system"
url: "https://spacecatalog.org/system/liesma"
release: "DR1"
licence: "No licence stated; acknowledgement requested"
citation: "This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. Cite Christiansen et al. (2025), Planetary Science Journal (doi:10.3847/PSJ/ade3c2), and the literature reference given with each value."
---

# The Liesma system

Liesma is a G0V yellow main-sequence star in Ursa Major, 288.9 ly away, with 2 known planets. Their orbits run from 0.0713 to 6.28 AU. All of them were detected by radial velocity.

## The planets, innermost first

| Planet | Orbit (AU) | Period | Radius | Mass | Equilibrium T |
| --- | --- | --- | --- | --- | --- |
| [HD 118203 b](https://spacecatalog.org/object/hd-118203-b) | 0.0713 | 6.135 d | 12.78 R⊕ | 680 M⊕ | 1361 K |
| [HD 118203 c](https://spacecatalog.org/object/hd-118203-c) | 6.28 | 13.97 yr | 12.40 R⊕ | 3750 M⊕ | 146 K |

Every figure is the planet's composite parameter from the [NASA Exoplanet Archive (Planetary Systems Composite Parameters)](https://exoplanetarchive.ipac.caltech.edu/cgi-bin/TblView/nph-tblView?app=ExoTbls&config=PSCompPars), one consistent set per world. Semi-major axes are orbits about the star, not distances from Earth.

This research has made use of the NASA Exoplanet Archive, which is operated by the California Institute of Technology, under contract with the National Aeronautics and Space Administration under the Exoplanet Exploration Program. Cite Christiansen et al. (2025), Planetary Science Journal (doi:10.3847/PSJ/ade3c2), and the literature reference given with each value.

## The host star

| Quantity | Value |
| --- | --- |
| CLASS | G0V yellow main-sequence star |
| SPECTRAL TYPE | G0V |
| MASS | 1.251 M☉ |
| RADIUS | 2.079 R☉ |
| SURFACE TEMPERATURE | 5944 K |
| LUMINOSITY | 4.12 L☉ |
| DISTANCE FROM EARTH | 288.9 ly |
| APPARENT MAGNITUDE | 8.05 |
| CONSTELLATION | Ursa Major |

The star itself: https://spacecatalog.org/object/liesma

The page itself, with the orbits drawn: https://spacecatalog.org/system/liesma