Ceres Low-Altitude Mapping Orbit (LAMO) |
Ceres Low-Altitude Mapping Orbit (LAMO) |
Dec 22 2015, 04:50 PM
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
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Jan 26 2016, 08:17 PM
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Member Group: Members Posts: 555 Joined: 27-September 10 Member No.: 5458 |
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Jan 26 2016, 08:46 PM
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Member Group: Members Posts: 716 Joined: 3-January 08 Member No.: 3995 |
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Jan 26 2016, 11:21 PM
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Junior Member Group: Members Posts: 48 Joined: 20-December 14 Member No.: 7370 |
Fascinating features. So what's with those radiating 'bird feet'? If I saw those hills on Earth, I'd think they were an erosional remnant of a larger mountain. But on Ceres, there is no apparent process to remove the material in such a manner. I favor the least interesting explanation as evident in LAMO G, I think it's due to settling and sliding of the puffy ejecta in-fill of the craters. Most craters* start out as an empty cones, and in-fill by their ejecta and landslides, and the ejecta of countless other craters. The craters are filled of unstable relatively puffy fine-grained ejecta. Subsequent impacts cause huge Ceres-quakes which will cause landslides (clearly evident all over the place) and settling, which I believe is the majority of the cracks on crater floors. *Most craters (other then young ones big enough to have lava in-fill at the time of creation, and very large ones (I don't know what that size is on Ceres, and it's probably a function of age)) e.g. old (earliest) craters have a harder surface which may rebound more. Also assuming it was mostly a molten interior at the time of formation, then the lava in-fill (and after a given crater could no longer expose lava) then elastic rebound would be decreasing as a function of age. The later craters would be formed in a puffy impact gardened surface which looks to be km thick. An impact in a loosely bound matrix would evacuate a clean cone and then have severe landslides back into the pit. It's even possible that most of the central peaks are in fact landslide conjunctions (i.e. if there are landslides all around the craters they would meet in the middle and after a few met the forming ridge/peak would accumulate subsequence landslide terminating debris as the crater in-filled. I think these type of processes may explain the majority of Cere's crater's features. I wonder what magnitude Cere's quake is generated for a given impact diameter and distance from the impact? |
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