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: 1084 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: 4544 The landing itself should occur around November 11th. We'll keep you informed |
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Oct 29 2014, 10:13 AM
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Member Group: Members Posts: 241 Joined: 22-August 05 From: Stockholm Sweden Member No.: 468 |
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Oct 29 2014, 12:34 PM
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Senior Member Group: Members Posts: 2346 Joined: 7-December 12 Member No.: 6780 |
I have no real unit for surface roughness. (is there one?) ... There are several measures of surface roughness, most of them related to the usual statistical techniques to describe a distribution. It's mostly about amplitudes in a hipass version of a DTM, or by applying the shape by shading philosophy and assuming constant albedo, about amplitudes of the brightness in a hipass version of the greyscale image. Dimension will be length in many cases, unit in meters, e.g. for the standard deviation; for variance it would be square meters. You could now correlate those surface roughness values with probabilities for successful landings, to provide a probability map of successful landing constrained to the surface roughness aspect. Adding slope etc. to a simulation of landings could provide an overall probability map for successful landing with Monte Carlo methods as the underlying principle. Besides geometric surface properties, the consistence of the material will play a key role for successful anchoring. |
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