---
title: "The HD 155918 system"
url: "https://spacecatalog.org/system/hd-155918"
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 HD 155918 system

HD 155918 is a G2VFe-1.0CH-0.6 yellow main-sequence star in Apus, 91.44 ly away, with 2 known planets. Their orbits run from 0.0300 to 13 AU. All of them were detected by radial velocity.

## The planets, innermost first

| Planet | Orbit (AU) | Period | Radius | Mass | Equilibrium T |
| --- | --- | --- | --- | --- | --- |
| [b](https://spacecatalog.org/object/hd-155918-b) | 0.0300 | 1.876 d | 2.67 R⊕ | 7.63 M⊕ | 1622 K |
| [c](https://spacecatalog.org/object/hd-155918-c) | 13 | 47.1 yr | 12.80 R⊕ | 1880 M⊕ | 77 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 | G2VFe-1.0CH-0.6 yellow main-sequence star |
| SPECTRAL TYPE | G2VFe-1.0CH-0.6 |
| MASS | 0.994 M☉ |
| RADIUS | 1.03 R☉ |
| SURFACE TEMPERATURE | 5781 K |
| LUMINOSITY | 1.08 L☉ |
| DISTANCE FROM EARTH | 91.44 ly |
| APPARENT MAGNITUDE | 7.00 |
| CONSTELLATION | Apus |

The star itself: https://spacecatalog.org/object/hd-155918

The page itself, with the orbits drawn: https://spacecatalog.org/system/hd-155918