{Spam?} Re: Soyuz orbital stage tumbling obs_additional data processing

From: Ralf Vandebergh (ralf.vandebergh@home.nl)
Date: Fri Jun 25 2010 - 13:17:58 UTC

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    As the second link may didn't work here a new try:
      ----- Original Message ----- 
      From: Ralf Vandebergh 
      To: seesat-l@satobs.org 
      Cc: Ralf Vandebergh 
      Sent: Friday, June 25, 2010 3:14 PM
      Subject: Soyuz orbital stage tumbling obs_additional data processing
      subject: Soyuz orbital stage tumbling obs_additional data processing
      Some additional measurements and analyses of the frames obtained of
      the tumbling motion of the Soyuz TMA-19 Rocket orbital stage on June 17
      provided quite interesting data.
      Between long-axis view and short-axis view of the rocket appeared to
      be a time between 1 and 2 seconds, probably no much longer then 1 second
      but precise estimation is not easy to give, as due to the 
      difficulties of manual tracking, especially with the apparant speed
      created by the low orbiting rocket (below 200km), there are missing
      frames, but measured over the entire sequence, the given time estimation
      is most realistic based on the available imaging data.
      1.5 second difference between long and short axis view would mean 
      a rotation (tumbling) period of 6 seconds. 
      This new animation is made of frames in a much more narrow time span
      then the first one (this shows almost one entire rotation in a
      time of 2 rotations (due to lost frames) but the effect is equally.
      Note that the visible shift (precession) can also partially an
      effect of the changing viewing angle during the fast pass:
      A visible flashing pattern due to tumbling of a rocket seems not
      inextricable linked to each other. 
      In this version of the same animation, you see an intentional decreased
      resolution to approach the view as seen with the naked eye (speck-size).
      At this way you can see the flashing pattern that would have been 
      visible for visual observers during that part of the pass. There appear
      to be no obvious flashes, more a little irrigular dim flashes:
      Ralf Vandebergh
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