The celestial activity began at 1:29 A.M. EST as a shadow from Io emerged on Jupiter's eastern limb. Observers tracking the gas giant also noted Mars positioned roughly 3° above Jupiter, while Jupiter itself rose just under 5° northwest of Regulus. During the sequence, Europa reappeared from an occultation behind the planet at 1:54 A.M. EST, shortly before Callisto began its transit at 2:07 A.M. EST.
The main event unfolded as Io passed north of Europa at 2:23 A.M. EST and entered its own transit at 2:42 A.M. EST. This set off a race across the face of the planet as Io caught up to and passed Callisto, moving west of it within half an hour. Io's shadow exited the western limb at 3:45 A.M. EST, while Callisto concluded its lengthy transit at 5:51 A.M. CST as morning twilight began.
