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Imagine walking on Hera’s asteroid

Written by  Friday, 30 June 2023 07:28
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Dimorphos asteroid seen by DART

The team working on ESA’s Hera asteroid mission has glimpsed its destination. Last September NASA’s DART mission returned images of the boulder-strewn Dimorphos moonlet just before impacting it, in an audacious and ultimately successful attempt to shift its orbit around its parent asteroid Didymos.

Following on from DART, Hera will carry with it a pair of shoebox-sized ‘CubeSats’ that conclude their own observations by landing on Dimorphos. Team members have been using DART images to help visualise this process of touchdown. And in the process they can't help but imagine: what would it be like for human

Milani studies asteroid dust
Milani studies asteroid dust

“You would want to avoid contact with surface rocks while gliding however, as they are likely to be sharp enough to snag your spacesuit, having never been smoothed by water or wind,” says Naomi. “Adding to the challenge, your weight would shift by about 10-20% depending on where you are on the surface, because of tidal forces from the Didymos parent asteroid.”

Navigation would present another difficulty, comments Patrick: “It is likely Dimorphos was tidally locked before DART’s impact, but is now probably either rotating or ‘librating’ – wobbling – as it orbits Didymos.” Either way, this means the local sky above an exploring astronaut would probably be shifting all the time, and disorientation might become a risk.


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