---
title: "The Kepler-357 system"
url: "https://spacecatalog.org/system/kepler-357"
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 Kepler-357 system

Kepler-357 is a star in Cygnus, 2246 ly away, with 3 known planets. Their orbits run from 0.0630 to 0.246 AU. All of them were detected by transit.

## The planets, innermost first

| Planet | Orbit (AU) | Period | Radius | Mass | Equilibrium T |
| --- | --- | --- | --- | --- | --- |
| [b](https://spacecatalog.org/object/kepler-357-b) | 0.0630 | 6.475 d | 1.84 R⊕ | 4.04 M⊕ | 793 K |
| [c](https://spacecatalog.org/object/kepler-357-c) | 0.120 | 16.86 d | 2.67 R⊕ | 7.61 M⊕ | 576 K |
| [d](https://spacecatalog.org/object/kepler-357-d) | 0.246 | 49.5 d | 3.43 R⊕ | 11.6 M⊕ | 402 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 |
| --- | --- |
| MASS | 0.794 M☉ |
| RADIUS | 0.834 R☉ |
| SURFACE TEMPERATURE | 5036 K |
| LUMINOSITY | 0.403 L☉ |
| DISTANCE FROM EARTH | 2246 ly |
| APPARENT MAGNITUDE | 15.73 |
| CONSTELLATION | Cygnus |
| STARS IN SYSTEM | 1 |

The star itself: https://spacecatalog.org/object/kepler-357

The page itself, with the orbits drawn: https://spacecatalog.org/system/kepler-357