NASA's Lucy will venture as close as 596 miles to this asteroid, an estimated 2 ½ miles in length but much shorter in width. Scientists should have a better idea of its size and shape following the brief visit. The spacecraft will zoom by at more than 30,000 mph.

On April 20, the over 50-foot-wide Lucy spacecraft approached as close as some 600 miles from Donaldjohanson, which is aptly named for the discoverer of the famed Lucy hominid fossil, paleoanthropologist Donald Johanson. The craft sped by at 30,000 mph, and used a specialized camera to capture a detailed view of the five-mile-wide asteroid.