Op 18-8-2011 14:17, Marco Langbroek schreef: > Op 17-8-2011 13:49, alain.figer@club-internet.fr schreef: >http://4.bp.blogspot.com/-ibh73hPrJLc/Tk0XqHpoE6I/AAAAAAAABdo/5RuqwJ9jegA/s1600/Nanosail_D_14082011_9_annot.png At first I thought how could it have a triple pattern? If it is rotating every .73 seconds you would see 4 spikes not 3 because nanosail has 4 sails like a pie sliced into 4 equal pieces. Then I thought - well if one sail was missing it would have 3 spikes but still there would be a "hole" in the pattern when the dark sale came by yet the pattern is equally spaced 3 spikes per grouping. Then I realized the answer. The sail is rotating 4 times slower - .73*4 or 2.92 seconds per rotation. Looking at your data again and looking at the waveform as though it should repeat every 4 red triangles the pattern repeats much more consistently! The curves and angles of the 4 sails are similar but different and distinct. You can see when the same sail comes by 4 red triangles later. Especially obivous when you include the yellow triangles in the pattern. Also your faint gray lines seem to have more useful information than the averaged darker line but using either line the pattern clearly repeats once every 4 red triangles. - George Roberts http://gr5.org _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l
This archive was generated by hypermail 2b29 : Thu Aug 18 2011 - 21:17:26 UTC
