But Rhea, Dione, and Tethys are much less conspicuous, and the other three cannot be seen without more powerful telescopes than those we are here dealing with.
So far as my own experience goes, I consider that the five larger satellites may be seen distinctly in good weather with a good 3-1/2-inch aperture.

I have never seen them with such an aperture, but I judge from the distinctness with which these satellites may be seen with a 4-inch aperture.

Titan is generally to be looked for at a considerable distance from Saturn--_always_ when the ring is widely open.

Japetus is to be looked for yet farther from the disc.

In fact, when Saturn comes to opposition in perihelion (in winter only this can happen) Japetus may be as far from Saturn as one-third of the apparent diameter of the moon.