NASA's spacecraft Lucy captured an image of its next flyby target, the asteroid Donaldjohanson.Lucy will pass within 960 km of the asteroid on April 20th and will continue to image it for the next two months.The asteroid Donaldjohanson is a main-belt, carbonaceous C-type asteroid, about 4 km in diameter.Lucy's flyby of Donaldjohanson will allow mission personnel to test and calibrate the spacecraft's navigation system and instruments.