Ceres Low-Altitude Mapping Orbit (LAMO) |
Ceres Low-Altitude Mapping Orbit (LAMO) |
Dec 22 2015, 04:50 PM
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#31
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Senior Member Group: Members Posts: 3008 Joined: 30-October 04 Member No.: 105 |
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Mar 15 2016, 08:32 PM
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#32
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Senior Member Group: Members Posts: 3419 Joined: 9-February 04 From: Minneapolis, MN, USA Member No.: 15 |
In re LAMO 45 again, not only do we see boulders up to at least 200 meters in their longest dimension, with an awful lot in the 50-meter range, the immediate ejecta blanket is extremely distinct, particularly the extraordinarily distinct edge of the ejecta blanket itself. Boulder streams are also well aligned with the patterning in the ejecta blanket. This is a wonderful example of impact cratering, actually...
There are literally hundreds of 50- to 500-meter craters in the imaged terrain outside of the ejecta blanket, while there are less than 10 of that size (and less than half of that are 500m or more) on the imaged portion of the blanket. In fact, much of the ejecta blanket is entirely crater-free; what patches of craters that do appear in a couple of spots look like they may be patterns of secondaries from only one or two close-by impacts. We don't have an empirically derived impact flux for Ceres, but I would think a surface this crater-free would have to be awfully young, geologically speaking. Hence my enthusiasm for a very young-looking crater, here... -the other Doug -------------------- “The trouble ain't that there is too many fools, but that the lightning ain't distributed right.” -Mark Twain
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