Moons of the Solar System
Natural satellites of the planets and dwarf planets of the Solar System that have a Wikidata entry, with parent body, discovery date and discoverers, size, mass and orbit. One row per moon.
Columns
Stable keys — use them in the API, SQL and code
| Key | Name | Type | Description |
|---|---|---|---|
| name | Moon | string | — |
| wikidata | Wikidata | entity | — |
| parent_name | Orbits | string | Planet or dwarf planet the moon orbits. |
| parent | Parent body | entity | — |
| discovery_date | Discovered | date | Date of discovery, at the precision Wikidata records. |
| discovered_by | Discovered by | string | People or teams credited with the discovery. |
| mean_radius_km | Mean radius | number · km | Mean radius in kilometres (half the diameter where only a diameter is recorded). |
| mass_kg | Mass | number · kg | Mass in kilograms. |
| orbital_period_days | Orbital period | number · days | Time to orbit the parent body once, in days (always positive; Wikidata sometimes marks retrograde orbits with a minus sign, which is dropped here). |
| semi_major_axis_km | Semi-major axis | number · km | Average distance from the parent body's centre, in kilometres. |
More in Space & Astronomy
Confirmed exoplanets
Every confirmed planet outside the Solar System in the NASA Exoplanet Archive, with its host star, discovery details, orbit, size, mass and temperature. One row per planet.
Stars visible to the naked eye
Every star in the HYG stellar database with apparent visual magnitude 6.5 or brighter, roughly the limit of naked-eye visibility under a dark sky. One row per star, with name, constellation, brightness, distance, spectral type and position.
Monthly sunspot number and solar radio flux
Monthly mean sunspot number counted by NOAA's Space Weather Prediction Center and the monthly mean 10.7 cm solar radio flux, the two standard measures of solar activity. One row per month.
Robotic space probes
Robotic space probes sent beyond Earth orbit — to the Moon, planets, the Sun, asteroids and comets — that have been launched, including launch failures. One row per spacecraft, with launch date, rocket, launch site, operator and international (COSPAR) designation.
Planets of the Solar System
The eight planets of the Solar System plus the dwarf planet Pluto, with mass, size, density, gravity, rotation, orbit, temperature and number of moons from NASA's Planetary Fact Sheet. One row per body.