Dwarf Earth Hygiea from the asteroid belt also has no moon. However, quite a few smaller sized asteroids (also known as slight planets) do have moons, but They're all far too faint to determine in almost any beginner telescope. Earth’s oceans, by comparison, only stretch down about 11 kilometers (under https://bestmoons04815.mybuzzblog.com/14493496/the-2-minute-rule-for-bestmoons