 From Jupiter's surface—or rather, from just above its cloudtops—Amalthea would appear very bright, shining with a magnitude of −4.7, similar to that of Venus from Earth.At only 8 arcminutes across, its disc would be barely discernible.Amalthea's orbital period is only slightly longer than its parent planet's day (about 20% in this case), which means it would cross Jupiter's sky very slowly.