Dawn Survey Orbit Phase, First orbital phase |
Dawn Survey Orbit Phase, First orbital phase |
Jul 17 2011, 09:09 AM
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#1
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Senior Member Group: Members Posts: 1729 Joined: 3-August 06 From: 43° 35' 53" N 1° 26' 35" E Member No.: 1004 |
I think it's time we start a new thread
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Aug 3 2011, 06:55 PM
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#2
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Member Group: Members Posts: 146 Joined: 31-October 08 Member No.: 4473 |
Ring decay seems unlikely to explain most of the grooves, since many of them (especially the far-northern big ones) are not "great circles" and thus curve along the surface, and could not have underlain a ring system, even if the rotation axis had shifted. Better mapping of the Vesta surface and the gravity figure as the mission progresses will shed light on this. If the gravity field is "weird" enough, it would discourage ring formation.
When I look at the distribution of crater ejecta back onto a rapidly-rotating Vesta from the south pole impact (who did that simulation?), plus massive seismic forcing, and then extension cracking with debris collapse, I see a possible explanation. But extension cracking is a bit dirty, and doesn't usually result in such straight lines. So I am not satisfied yet with this picture. |
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Aug 3 2011, 07:26 PM
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#3
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Senior Member Group: Members Posts: 1591 Joined: 14-October 05 From: Vermont Member No.: 530 |
When I look at the distribution of crater ejecta back onto a rapidly-rotating Vesta from the south pole impact (who did that simulation?) http://www.planetary.org/blog/article/00002906 Jutzi/Asphaug... who incidentally just tried to explain the moon's farside/nearside dichotomy with impact sims. |
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