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
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