NH Arrokoth (formerly Ultima Thule) Encounter Observations & Results, post-flyby discussion as the data arrives |
NH Arrokoth (formerly Ultima Thule) Encounter Observations & Results, post-flyby discussion as the data arrives |
Jan 4 2019, 01:16 AM
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Merciless Robot Group: Admin Posts: 8784 Joined: 8-December 05 From: Los Angeles Member No.: 602 |
This will be where we talk about the data as it arrives over the next 20 months or so.
-------------------- A few will take this knowledge and use this power of a dream realized as a force for change, an impetus for further discovery to make less ancient dreams real.
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Mar 18 2019, 03:53 PM
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Solar System Cartographer Group: Members Posts: 10186 Joined: 5-April 05 From: Canada Member No.: 227 |
I was in that session at LPSC - they are working on shape and stereo but more to do for a final shape model. Then the images can be merged effectively.
Jeff Moore said they are not convinced the small pits are impact craters, and suggest some may be drainage depressions leading into sub-surface voids. Not sure I agree, but a size distribution plot would be a useful thing to help with that problem. Phil -------------------- ... because the Solar System ain't gonna map itself.
Also to be found posting similar content on https://mastodon.social/@PhilStooke Maps for download (free PD: https://upload.wikimedia.org/wikipedia/comm...Cartography.pdf NOTE: everything created by me which I post on UMSF is considered to be in the public domain (NOT CC, public domain) |
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Mar 18 2019, 04:06 PM
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#3
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Member Group: Members Posts: 684 Joined: 24-July 15 Member No.: 7619 |
I was in that session at LPSC - they are working on shape and stereo but more to do for a final shape model. Then the images can be merged effectively. Jeff Moore said they are not convinced the small pits are impact craters, and suggest some may be drainage depressions leading into sub-surface voids. Not sure I agree, but a size distribution plot would be a useful thing to help with that problem. Phil Curious, if there is void filling, would the "Brasil nut effect" being temperature dependent change things? There has been some suggestion that size sorting is temperature dependent,
Reverse Brazil Nut Problem A paper by Hong et al. in 2001 predicted the "reverse Brazil nut effect", in which under certain conditions, their numerical observation showed the opposite effect - large beads falling to the bottom of a container, and small beads rising to the top of the container. [4,5] A previous finding of theirs showed that a system of hard sphere condenses in the presence of gravity below a critical temperature Tc [6].P.V. Quinn and D.C. Hong, Phys. Rev. E 62, 8295 (2000). Rather interesting to consider the possibility of thermodynamics past Pluto driving "grain tectonics". Imagine if the Brazil-nut effect shakes warm KBOs into minimum surface spheres; while the reverse-Brasil-nut-effect shakes cool KBOs into maximum sufrace pancake? |
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