Philae landing on the nucleus of Comet 67P C-G |
Philae landing on the nucleus of Comet 67P C-G |
Sep 23 2014, 12:16 PM
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Senior Member Group: Members Posts: 1089 Joined: 19-February 05 From: Close to Meudon Observatory in France Member No.: 172 |
Now, it's time to open a new section devoted to the landing of the Philae lander itself on the nucleus of Comet 67P C-G. Also to answer better the earlier post, http://www.unmannedspaceflight.com/index.p...st&p=212943 and for your information, here is the quick summary (as a "pdf" file) of the events that are expected to occur during landing on the nucleus and after : it's the timeschedule on which we are working to set up our EPO event in Paris. Sequence_ATTERRISSAGE10_UMSF.pdf ( 263.81K ) Number of downloads: 4563 The landing itself should occur around November 11th. We'll keep you informed |
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Nov 1 2014, 07:55 PM
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Member Group: Members Posts: 169 Joined: 17-March 06 Member No.: 709 |
Just want to add some more details on why I think that Philae will sink "out of sight."
First, here is the link to the Schultz, et al, paper, "The Deep Impact oblique impact cratering experiment" - http://www.planetary.brown.edu/pdfs/3589.pdf In section 5, "Concluding remarks," there is reference to the low-density (0.2 - 0.5 g/cc) and highly porous (90%) surface of comet Tempel 1. Here is a photo of one of Viking 1's footpads totally buried in a surface deposit - This "burial"event occurred during the Viking landing. Similar "burials" have plagued the MER rovers on Mars. These are examples of loosely consolidated, probably very-fine, particle piles. Even with a respectable gravity field, these Martian "traps" remain very porous. In the case of comets, my guess is that some of the very fine particles expelled in gaseous jets fall back very slowly to the comet surface. The extremely low gravity on a comet would mean that those accumulations of particles will remain very porous, with a very low density. So, Tommy Gold may finally be vindicated, albeit not with respect to the Moon. So, there is my prediction on the fate of Philae as it makes contact with the surface of Comet CG. I may be wrong, but that is OK. Part of the business of science and exploration is the risk of predictions. I await the landing with anticipation. Another Phil |
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