Hi folks: OK I checked...M81-M82 spans ~ 1 degree so the whole FOV is: 2 x 2.7 degree.. so a small segment of any bird transverse trail will look 'linear' in such a small FOV. The sharp bent is another bird that change direction. rgds ykchia > Hi folks: I did not check the frame FOV in degrees. I have encountered night birds that can produce surprising straight/linear trajectories ( only detectable as bird in video playback) and also the various hair-pin sharp turns after that( as one of the trail exhibited it) even in my 12x14 degree of FOV. So my take: both are objects of the feathered kind. rgds ykchia -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ . ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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