---
title: "The GJ 3929 system"
url: "https://spacecatalog.org/system/gliese-gj-3929"
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 GJ 3929 system

GJ 3929 is an M6  : red star in Corona Borealis, 53.47 ly away, with 2 known planets. Their orbits run from 0.0252 to 0.0810 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/gj-3929-b) | 0.0252 | 2.616 d | 1.09 R⊕ | 1.75 M⊕ | 568 K |
| [c](https://spacecatalog.org/object/gj-3929-c) | 0.0810 | 15.04 d | 2.26 R⊕ | 5.71 M⊕ | 317 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 | M6  : red star |
| SPECTRAL TYPE | M6  : |
| LUMINOSITY | 0.00196 L☉ |
| DISTANCE FROM EARTH | 53.47 ly |
| APPARENT MAGNITUDE | 12.69 |
| CONSTELLATION | Corona Borealis |

The star itself: https://spacecatalog.org/object/gliese-gj-3929

The page itself, with the orbits drawn: https://spacecatalog.org/system/gliese-gj-3929