June as seen by 100-inch Hooker telescope at Mt. Wilson Observatory in four wavelength bands

3 Juno (symbol: ) is a main belt asteroid discovered by Karl Ludwig Harding on September 1, 1804. Juno was the third asteroid discovered in the Solar System and is named after Juno, the Roman goddess that is the queen of all gods.

Size comparison: the first 10 asteroids discovered, profiled against Earth's Moon. Juno is third from the left.

Juno is an S-type asteroid, and is estimated to contain 1% of the total mass of the asteroid belt. view more...