Telesto is a small, icy moon of Saturn with a mean radius of about 12.4 km, making it one of the planet’s tiny moons. It shares Tethys’ orbit and resides at a Lagrange point (L4)—specifically, 60 degrees ahead of Tethys in its path around Saturn. This stable orbital configuration classifies Telesto as a Trojan moon, and more specifically, a Tethys Trojan.

Unlike many of Saturn’s other moons, Telesto’s surface is unusually smooth and shows very few impact craters, suggesting either a younger surface or some resurfacing process that covers old craters—possibly involving fine, icy particles settling from Saturn’s E ring or some geological activity.

Telesto was discovered in 1980 by a team including B. Smith, Harold Reitsema, Stephen Larson, and John Fountain through ground-based observations.

Let me know if you want a comparison with other Trojan moons, surface geology theories, or its relationship with Tethys and Calypso (the other Tethys Trojan).