The four largest moons of Jupiter—Io, Callisto, Ganymede, and Europa—were the first objects in the solar system discovered with a telescope.

Moons of Jupiter

Jupiter's moons form a satellite system called the Jovian system. The most massive of the moons are the four Galilean moons: Io, Europa, Ganymede, and Callisto.

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Discussion

It’s pretty cool that you can see them with binoculars!

Absolutely. My next project in my garden is an area to view the stars. I have already cleared it and I want to make a deck or platform maybe. Then get a good set of binoculars. I prefer them over a telescope in some ways.

I’d like to get a telescope 🔭 but I’m fairly certain I’ll only use it maybe 10 times a year 🤣 and I can’t justify the expense

Same here. Binoculars are much more portable and useful anyway. 👍

I'm thinking of buying one of those smartphone camera lens, just don't know of they are any good

Not sure. Maybe check some reviews on YouTube

A Dobsonian telescope is a reasonable cost option for occasional viewing. (The downside is storage space for a Newtonian reflector)