The outer Uranian moon becomes known

Titania's detection showed that the recently identified planet was orbited by moons.

Herschel's observation of Titania demonstrated that distant satellites could be detected from Earth.

Oberon was observed on the same night as Titania, revealing a second moon of Uranus.

The paired discoveries changed astronomers' picture of the recently found planet.

Oberon and Titania were identified together; modern spacecraft later examined both worlds.

From Palermo, Piazzi spotted an object between Mars and Jupiter that later became known as Ceres.

Initially understood as a new planet, Ceres was later classed among asteroids and then as a dwarf planet.

Piazzi's discovery gave observers a new moving object whose orbit needed determination.

The discovery marked the first identification of an object in the asteroid belt.

Galle and d'Arrest found the predicted planet near a position calculated by Le Verrier.