From: David Dunham [dunham@starpower.net]
Sent: Thursday, October 18, 2007 1:37 AM
To: Dunham, David
Subject: Fwd: Suits update on ZC2702
To: David Dunham <dunham@starpower.net>
Subject: Suits update on ZC2702
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From: Frank Suits <suits@us.ibm.com>
Date: Wed, 17 Oct 2007 23:47:24 -0400
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I confirm 2 disappearances - more details in attached note below.
I loaded my avi into LiMovie and created the attached plots.
Frame rate is 56.91/s

Background values are pulsed at 1s intervals with an accuracy of 1us. This will allow exact timing of the events, but I will need to analyze it more.

I believe these plots show diffraction effects.

Frank

----- Forwarded by Frank Suits/Watson/IBM on 10/17/2007 11:31 PM -----
Frank Suits/Watson/IBM

10/17/2007 09:00 PM

David Dunham <dunham@starpower.net>

cc
Subject

Re: Mostly clear, Virginia to Pennsylvania, for ZC 2702 graze this evening Link

David:

I am pleased to report that I was able to see the graze from the Hudson valley.
I saw at least two disappearances.
It will take me some time to process the data - it was taken in a somewhat novel, but I hope accurate way.
Here is a summary of info:

Event ZC 2702 graze, Oct 17, 2007 8pm EDT
Location: Garrison, NY 10524
73 56.264W 41 22.874N 12' accuracy from GPS
Altitude 242 feet
Temp approx 60F

Equipment:
C11 on CGE with reducer to approx f/5
Lumenera SKYnx 2-0M USB video camera
Captured with Lucam Recorder, which includes timestamps, at 56 fps, 240x240 pixels

IN ADDITION
I had a small LED in front of the telescope hooked up to a Garmin 18LVC gps unit, providing a 20ms pulse of light accurate to 1us.
Finally, I used WWV to calibrate the computer time, so the offset of the timestamps is roughly known, and then nailed by the LED.

I now have a 1.8 GB AVI file at 56 fps, 240x240 pixels. It is too big to load into registax. I have a corresponding list of timestamps for each frame. Finally, on every second, the frame lightens a bit due to the LED. This should provide accuracy approximately equal to the frame time, or about 10-20ms.

I plan to process this with my own code to get times accurately. If you have tools to work with this particular format, or people willing to receive the file, that would be fine also.

Thanks,
Frank Suits


whole graze
1st disappearance
1st reappearance
2nd disappearance
2nd reappearance