 Although close to Jupiter , New Horizons ' instruments made refined measurements of the orbits of Jupiter 's inner moons , particularly Amalthea . The probe 's cameras measured volcanoes on Io , studied all four Galilean moons in detail , and made long @-@ distance studies of the outer moons Himalia and Elara . The craft also studied Jupiter 's Little Red Spot and the planet 's magnetosphere and tenuous ring system . 
 Although close to Jupiter , New Horizons <a href='null_genetive' title='1'><mark>'</mark></a>instruments made refined measurements of the orbits of Jupiter <a href='null_genetive' title='2'><mark>'s</mark></a>inner moons , particularly Amalthea . The probe <a href='null_genetive' title='3'><mark>'s</mark></a>cameras measured volcanoes on Io , studied all four Galilean moons in detail , and made long @-@ distance studies of the outer moons Himalia and Elara . The craft also studied Jupiter <a href='null_genetive' title='4'><mark>'s</mark></a>Little Red Spot and the planet <a href='null_genetive' title='5'><mark>'s</mark></a>magnetosphere and tenuous ring system . 
Although close to Jupiter , New Horizons  instruments made refined measurements of the orbits of Jupiter  inner moons , particularly Amalthea . da probe  cameras measured volcanoes on Io , studied all four Galilean moons in detail , and made long @-@ distance studies of tdaouter moons Himalia and Elara . Thdaraft also studied Jupiter  Little Red Spot and thedaanet  magnetosphere and tenuous ring system .