From: Ralf Vandebergh (
Date: Tue Aug 17 2010 - 13:49:33 UTC

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    To see what the seeing is doing, see this ani:
      ----- Original Message ----- 
      From: Ralf Vandebergh 
      Sent: Tuesday, August 17, 2010 3:03 PM
      Subject: ISS OBSERVATIONS_Aug 14, 2010
      subject: ISS OBSERVATIONS_Aug 14, 2010
      Showed are 2 frames out of a favorable pass on Aug 14 during the
      current morning-visibility period. It's interesting to see the
      minor changes of the detail by the seeing, although the
      conditions were quite good. This is a great illustration 
      of my general argument that stacking satellite images
      must be considered with care. As we never have many frames
      to stack, due to the fast movement and rapidly changing
      observing angle of the objects, the obtained average could
      be a more blurred result then one single frame provides. 
      Only in real exellent conditions, stacking satellite
      images starts to show gain.
      Imagery: manually tracked 10inch Newtonian @0.25''/p
      in quite steady conditions (but not excellent).
      Ralf Vandebergh
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