---
title: "The HD 42813 system"
url: "https://spacecatalog.org/system/hd-42813"
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 42813 system

HD 42813 is a K0V orange dwarf in Lepus, 248.6 ly away, with 3 known planets. Their orbits run from 0.0452 to 0.111 AU. All but one were detected by radial velocity.

## The planets, innermost first

| Planet | Orbit (AU) | Period | Radius | Mass | Equilibrium T |
| --- | --- | --- | --- | --- | --- |
| [HIP 29442 c](https://spacecatalog.org/object/hip-29442-c) | 0.0452 | 3.538 d | 1.55 R⊕ | 4.5 M⊕ | 1123 K |
| [HIP 29442 d](https://spacecatalog.org/object/hip-29442-d) | 0.0673 | 6.43 d | 1.54 R⊕ | 5.14 M⊕ | 920 K |
| [TOI-469.01](https://spacecatalog.org/object/toi-469-01) | 0.111 | 13.63 d | 3.41 R⊕ | 9.1 M⊕ | 716 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 | K0V orange dwarf |
| SPECTRAL TYPE | K0V |
| RADIUS | 1.008 R☉ |
| SURFACE TEMPERATURE | 5237 K |
| LUMINOSITY | 0.809 L☉ |
| DISTANCE FROM EARTH | 248.6 ly |
| APPARENT MAGNITUDE | 9.49 |
| CONSTELLATION | Lepus |

The star itself: https://spacecatalog.org/object/hd-42813

The page itself, with the orbits drawn: https://spacecatalog.org/system/hd-42813