---
title: "The GJ 3473A system"
url: "https://spacecatalog.org/system/gliese-gj-3473a"
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 3473A system

GJ 3473A is a K-M orange star in Canis Minor, 79.55 ly away, with 2 known planets. Their orbits run from 0.0159 to 0.0876 AU. All but one were detected by transit.

## The planets, innermost first

| Planet | Orbit (AU) | Period | Radius | Mass | Equilibrium T |
| --- | --- | --- | --- | --- | --- |
| [GJ 3473 b](https://spacecatalog.org/object/gj-3473-b) | 0.0159 | 1.198 d | 1.26 R⊕ | 1.86 M⊕ | 773 K |
| [GJ 3473 c](https://spacecatalog.org/object/gj-3473-c) | 0.0876 | 15.51 d | 2.63 R⊕ | 7.41 M⊕ | 329 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 | K-M orange star |
| SPECTRAL TYPE | k-m |
| LUMINOSITY | 0.00172 L☉ |
| DISTANCE FROM EARTH | 79.55 ly |
| APPARENT MAGNITUDE | 13.70 |
| CONSTELLATION | Canis Minor |

The star itself: https://spacecatalog.org/object/gliese-gj-3473a

The page itself, with the orbits drawn: https://spacecatalog.org/system/gliese-gj-3473a