Atlas of Worlds

Satellite catalog

The confirmed moons of planets and dwarf planets, with the measurements we have and the gaps we still have to fill.

465 moons · snapshot 2026-09-09 · catalog 1.0.0

Download catalog JSONField coverageCorrection history
Parent systemConfirmed moonsWith mass estimates
MercuryPlanetConfirmed moons0Mass estimates0
VenusPlanetConfirmed moons0Mass estimates0
EarthPlanetConfirmed moons1Mass estimates1
MarsPlanetConfirmed moons2Mass estimates2
JupiterPlanetConfirmed moons115Mass estimates9
SaturnPlanetConfirmed moons293Mass estimates16
UranusPlanetConfirmed moons29Mass estimates5
NeptunePlanetConfirmed moons16Mass estimates7
CeresDwarf planetConfirmed moons0Mass estimates0
PlutoDwarf planetConfirmed moons5Mass estimates3
HaumeaDwarf planetConfirmed moons2Mass estimates0
MakemakeDwarf planetConfirmed moons1Mass estimates0
ErisDwarf planetConfirmed moons1Mass estimates0

What is counted

Confirmed natural satellites of the 8 planets and the 5 recognized dwarf planets. Naming, permanent numbering, and confirmation are separate states: unnamed moons belong here too.

Mass estimates exclude upper limits. An empty field means these sources provide no value; it does not mean zero.

Other small-body satellites remain outside this release. Moons per world compares counts for the reference worlds.

JSON Schema · Yale Thomas · CC-BY-4.0. Public facts and upstream material retain their source terms.