NASA's DART mission is scheduled to launch no earlier than 1:20 a.m. EST Wednesday, November 24
NASA/Naidu et al., AIDA Workshop, 2016Asteroid Didymos and Dimorphos’ two year orbit of the Sun is slightly inclined to those of the planets and also slightly eccentric; it’s found just beyond Earth to just beyond Mars.
When DART reaches it in the fall of 2022 Didymos and Dimorphos will be approximately 6.8 million miles away from Earth. Rotating every 2.26 hours, Didymos and Dimorphos are separated by about half a mile. They were discovered in 1996. Binary asteroids aren’t particularly rare—it’s reckoned that one sixth of NEAs are binary.planetary defence, find out more about asteroids, and demonstrate novel technologies. Hera will carry two CubeSats that will get up close and personal with Didymos and its partner, Dimorphos.
It will arrive in September 2022. Late that month or early in October 2022 the 500 kg DART will use its on-board autonomous navigation system to crash into Dimorphos at about 15,000 miles per hour and, hopefully, change its orbital velocity by 0.4 mm/s, which will in turn slightly alter the trajectory of Didymos. “Slightly alter” might give the impression of a subtle poke, but that’s not the case.
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