 Amalthea ( / <unk> / am @-@ <unk> @-@ <unk> @-@ ə ; Greek : <unk> ) is the third moon of Jupiter in order of distance from the planet . It was discovered on 9 September 1892 , by Edward Emerson Barnard and named after Amalthea , a nymph in Greek mythology . It is also known as Jupiter V. 
