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Mission: Hayabusa 2
Hungry4info
post Today, 04:29 AM
Post #376


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If my math is right, assuming a radius of 450 metres, Ryugu needs a density of at least ~0.26 g cm-3 to have a Hill sphere out to Hayabusa 2's distance. So that sounds plausible.

Edit: Apparently that's what the mission team thinks too.
https://twitter.com/haya2_jaxa/status/1009368813429592064

QUOTE
From now on, the gravity of the asteroid will dominate the area (Hill area: Within about 90km from the asteroid)!


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