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How many moons does Jupiter have?

From four to 115 — and why the count keeps climbing.

Published 2026-10-23

As of 9 April 2026, Jupiter has 115 known moons.[4]

Recent jumps

In 2026 the Minor Planet Center announced four new moons of Jupiter on 16 March and fourteen more on 9 April, bringing the count to 115.[4]

What isn’t counted

The total excludes metre-sized moonlets thought to be shed from the inner moons, and hundreds of possible kilometre-sized irregular moons that may only be briefly captured.[4]

How many more?

One survey team estimated the population of retrograde Jovian moons brighter than magnitude 25.7 at around 600, within a factor of 2.[4]

Future surveys

The Vera C. Rubin Observatory’s 8.4-metre telescope will probe Jupiter’s irregular moons down to about 1 km across, at magnitude 24.5.[4] Erinome, about 3 km across, was found long before such surveys.[1]

Numbered citations link to the sources list on the Erinome overview page.

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