RE: DCB Obs 2/20/09

From: Greg Roberts (
Date: Sat Feb 21 2009 - 11:20:56 UTC

  • Next message: Igor Lissov: "Re: Cosmos Illustration: Accurate?"

    Hi Derek
    I checked out your picture of the event and the time etc in GUIDE. I cant find 
    any error in what you did. It looks like you measured the correct end of the 
    trail and on elements dated 9047.831 UT I get the satellite running about 2.7 
    seconds late on those predictions.
    For your time of 03h20m42.825s UT I measure the RA as 05h35m53.1s and Dec 
    as -05d 12'34" - the RA is the same as yours but dec about 30 arc seconds out 
    which is okay considering the image scale. I found it a little difficult to 
    match the entire image to GUIDE - due to optical defects in the corrector lens I 
    found the x and y  scales to be different - also I had to rotate the field a bit 
    but even then could not get images to line up across the entire field by 
    fiddling image scale and field rotation. I eventually blew your image up 200% 
    and just concentrated on trying to line up the stars around the end of the 
    trail. Incidentally your stars are getting down to about mag +12 to +13.
    Lets see what Ted comes up with...
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