---
title: "The HIP 41378 system"
url: "https://spacecatalog.org/system/hip-41378"
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 41378 system

HIP 41378 is an F8 yellow-white star in Cancer, 381.0 ly away, with 6 known planets. Their orbits run from 0.130 to 1.39 AU. All but one were detected by transit.

## The planets, innermost first

| Planet | Orbit (AU) | Period | Radius | Mass | Equilibrium T |
| --- | --- | --- | --- | --- | --- |
| [b](https://spacecatalog.org/object/hip-41378-b) | 0.130 | 15.57 d | 2.64 R⊕ | 6.9 M⊕ | 959 K |
| [c](https://spacecatalog.org/object/hip-41378-c) | 0.209 | 31.71 d | 2.74 R⊕ | 5.97 M⊕ | 757 K |
| [e](https://spacecatalog.org/object/hip-41378-e) | 0.680 | 393 d | 5.19 R⊕ | 7.62 M⊕ | 335 K |
| [d](https://spacecatalog.org/object/hip-41378-d) | 1.17 | 278.4 d | 3.65 R⊕ | 6.53 M⊕ | 367 K |
| [f](https://spacecatalog.org/object/hip-41378-f) | 1.39 | 542.1 d | 9.47 R⊕ | 25 M⊕ | 294 K |
| [g](https://spacecatalog.org/object/hip-41378-g) | — | 63.19 d | 2.50 R⊕ | 6.81 M⊕ | 605 K |

1 with no published orbit, sorted last.

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 | F8 yellow-white star |
| SPECTRAL TYPE | F8 |
| LUMINOSITY | 3.28 L☉ |
| DISTANCE FROM EARTH | 381.0 ly |
| APPARENT MAGNITUDE | 8.93 |
| CONSTELLATION | Cancer |

The star itself: https://spacecatalog.org/object/hip-41378

The page itself, with the orbits drawn: https://spacecatalog.org/system/hip-41378