---
title: "The HIP 34730 system"
url: "https://spacecatalog.org/system/hip-34730"
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 HIP 34730 system

HIP 34730 is an M0.5V red dwarf in Lynx, 156.6 ly away, with 4 known planets. Their orbits run from 0.0266 to 0.151 AU. All of them were detected by transit.

## The planets, innermost first

| Planet | Orbit (AU) | Period | Radius | Mass | Equilibrium T |
| --- | --- | --- | --- | --- | --- |
| [LHS 1903 b](https://spacecatalog.org/object/lhs-1903-b) | 0.0266 | 2.156 d | 1.38 R⊕ | 3.28 M⊕ | 796 K |
| [LHS 1903 c](https://spacecatalog.org/object/lhs-1903-c) | 0.0539 | 6.226 d | 2.05 R⊕ | 4.55 M⊕ | 559 K |
| [LHS 1903 d](https://spacecatalog.org/object/lhs-1903-d) | 0.0860 | 12.57 d | 2.50 R⊕ | 5.96 M⊕ | 442 K |
| [LHS 1903 e](https://spacecatalog.org/object/lhs-1903-e) | 0.151 | 29.32 d | 1.73 R⊕ | 5.79 M⊕ | 333 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 | M0.5V red dwarf |
| SPECTRAL TYPE | M0.5V |
| LUMINOSITY | 0.0262 L☉ |
| DISTANCE FROM EARTH | 156.6 ly |
| APPARENT MAGNITUDE | 12.21 |
| CONSTELLATION | Lynx |

The star itself: https://spacecatalog.org/object/hip-34730

The page itself, with the orbits drawn: https://spacecatalog.org/system/hip-34730