Discovered on September 9th 1892 Amalthea was the fifth of Jupiter’s satellite’s to be discovered. It is discovered by Edward Bernard. It is the third moon in distance from Jupiter and was the last moon to be discovered visually. In future all would be discovered photographically. It was the first new satellite of Jupiter since Galileo Galilei's discovery of the Galilean satellites in 1609/10.
It is a small moon with dimensions of 250 × 146 × 128 km. Amalthea orbits Jupiter at a distance of around 181,000 km.