Piazzi discovers Ceres

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.

Oberon's discovery expanded the family of known moons beyond Saturn.

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.

Perturbations in Uranus's orbit had led Le Verrier and independently Adams toward a possible unseen planet.