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#67P/Churyumov-Gerasimenko 1 (1969 R1), International Rosetta Mission, Osiris - Wide Angle Camera, Rosetta Extension 2 -@ESA_Rosetta photo from https://imagearchives.esac.esa.int/picture.php?/175892/list/43933,28311,133382,94439,121029,17024,52563,163365,132961,151551,153977,87107,175892,86605,98934 …pic.twitter.com/cZ2YwQpN6w
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I’ve known the green slide & the red rift for 6 years but this photo allowed me just now to realise why the slides went up the head disproportionately high at Bastet and Ma’at/Serqet border but not at central Ma’at. I noted it 6 years ago on the blog but couldn’t explain it
#67P https://twitter.com/CometFragment/status/1475677921264209923 …pic.twitter.com/iZM3oEe7If
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A long summary of what Rosetta mission found on comet
#67P. By Kathrin Altwegg https://twitter.com/PhysicsToday/status/1478395687721185280 … -
But they’re not all rubble piles. It’s impossible for a rubble pile to rotate below a certain rate. It needs cohesion- so not a rubble pile. Threshold for fragmentation is very closely related to rw^2 = GM/r^2 for satellites. My ‘spin-up calcs’ link applies it to single body
#67P pic.twitter.com/EqdNcixXTL
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…because the rotation period ratio isn’t big enough for the size ratio. So one could start by assuming the larger is near failure and derive the spin rate for the former via AM. This is what I did for
#67P but the opposite way round: original>bilobe. https://scute1133site.wordpress.com/spin-up-calcs/
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