Susanna is the moon of Fels. It is slightly larger than the Earth's Moon, though about 20% farther out in its orbit. As with the Earth's Moon, it is an airless globe. It was named by Lennart Fels after his daughter. The name, a throwback to a forgotten technological age, has remained unchanged all these years.
It is known as Susanna only in the southern Three Rivers. It has other, unrelated names in other parts of the world.