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Abstract:
This segment discusses the first detailed images of asteroid 52246 Donaldjohanson, captured by NASA's Lucy spacecraft during its flyby on Easter Sunday. The asteroid, discovered in 1981 and previously just a point of light, was imaged from a distance of 600 km. The images reveal an elongated, 4 km object with a narrow waist, suggesting it's a contact binary formed from two smaller bodies that slowly merged. Small impact craters are visible on its surface. The asteroid is identified as being less than 150 million years old, belonging to the Erigone ("origami" in transcript) family, which originated from a larger parent body breakup. It was named Donaldjohanson in 2015, honoring the paleontologist, after mission planners identified it as a target for the Lucy mission en route to Jupiter's Trojan asteroids.
Lucy Spacecraft's Flyby of Asteroid 52246 Donaldjohanson
00:00:03 First Images: The Lucy spacecraft captured the first detailed images of asteroid 52246 Donaldjohanson during its flyby on Easter Sunday.
00:00:11 Asteroid Details: The asteroid is small (4 km across) and was discovered in 1981, remaining just a point of light until this flyby.
00:00:18 Close Approach: Lucy came within 600 km of Donaldjohanson. This flyby is a step on Lucy's journey towards the Trojan asteroids near Jupiter.
00:00:26 Contact Binary Shape: Images show Donaldjohanson is an elongated object with a narrow waist, indicating it is likely a contact binary.
00:00:31 Formation Theory: The asteroid's shape suggests it formed when two separate objects orbiting each other slowly coalesced into a single body.
00:00:38 Surface Features: Small craters are visible on the surface, resulting from past collisions with other asteroids.
00:00:42 Young Age: Donaldjohanson is estimated to be less than 150 million years old.
00:00:46 Asteroid Family: It belongs to the Erigone (referred to as "origami" in the transcript) family of asteroids, which formed from the breakup of a larger parent body about 150 million years ago.
00:00:56 Naming History: Although discovered in 1981, the asteroid was named Donaldjohanson in 2015 specifically because Lucy mission planners identified it as a flyby target.
00:01:05 Namesake: The asteroid is named after Donald Johanson, the paleontologist famous for discovering the early hominin fossil "Lucy".