**Previous message:**Giuseppe N. Gerbore: "UNID crossing the Moon"**In reply to:**Giuseppe N. Gerbore: "UNID crossing the Moon"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]

It would be interesting to see a still image, and how you arrived at the 4" size. But even more useful for identification of a possible/likely satellite is the exact time of passage! 2011/10/12 Giuseppe N. Gerbore <giuseppegerbore@virgilio.it> > Yesterday night I captured by chance something crossing the Moon: > http://www.youtube.com/watch?v=XWUi4wIWnO8 > > Seems to me a satellite, but .. let us do some calculation: > > Data: > > Image angle 4'' > > Captured path 15' > > Transit time 1.93s > > > > By using the approximate relation: sin(A)=Diametre/Range: > > > > 1) Plane (D=50m) Range =50/sin(4'') > =2 578 310 m > > Path > =50*60*15/4 = 11 250 m > > Velocity =11 > 250/1.93 = 5 829 m/s > > 2) Satellite (D=10m) Range =10/sin(4'') > = 515 662 m > > Path > =10*60*15/4 = 2 250 m > > Velocity =2 250/1.93 > = 1 165 m/s > > 3)Bird (D=0.3m) Range =0.3/sin(4'') > = 15 469 m > > Path > =0.3*60*15/4 = 67.5 m > > Velocity =67.5/1.93 > = 34.9 m/s > > 4) Mosquito (D=0.005m) Range =0.005/sin(4'') = > 257 m > > Path > =0.005*60*15/4 = 1.125 m > > Velocity =1 125/1.93 > = 0.58 m/s > > > > Velocity assumed at right angle with line of sight. Might be much more if > object approaching or moving away from the observer. > > > > Am I talking complete nonsense? > > > > > > Giuseppe > > > > Casa, 44.64°N, 10.90°E, 57m asl. > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > http://mailman.satobs.org/mailman/private/seesat-l/attachments/20111012/7bf3ba13/attachment.html > _______________________________________________ > Seesat-l mailing list > http://mailman.satobs.org/mailman/listinfo/seesat-l > -- ---------------------------------------- Björn Gimle, COSPAR 5919 59.2576 N, 18.6172 E, 23 m Phone: +46 (0)8 571 43 312 Mobile: +46 (0) 704 385 486 -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mailman.satobs.org/mailman/private/seesat-l/attachments/20111012/c04019a8/attachment.html _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l

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