How many confirmed moons does Jupiter have?

How to get close to this number

Reason from gravity and neighbourhood. The largest planet in the solar system sits next to the asteroid belt, so it has both the strongest capture pull and a rich supply of objects to capture. That points to a large count — dozens at minimum, and plausibly into three figures. The twist is that it does not hold the record: Saturn, smaller but surrounded by its own swarm of captured debris, has more.

The mental model that misleads is thinking of moons as bodies like our own. Most of these are irregular rocks a few kilometres across, captured rather than formed in place, on distant and often backward orbits. Only a handful are large enough to be spherical. Once you stop picturing moons and start picturing captured debris, a count in the hundreds stops being surprising.

The count is genuinely unstable, and that is the most honest thing to say about it. As the explanation notes, it crossed 100 and then jumped again within weeks — not because moons appeared but because telescopes improved and survey campaigns looked harder. A figure like this measures detection capability as much as it measures the planet, which is why it is stamped with a year and a specific registering body.