From: Ted Molczan (
Date: Sun May 23 2004 - 15:26:11 EDT

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    John Locker wrote:
    > Looking at the disk of Jupiter I now think the E-W  FOV was 
    > more like 2.5 arc minutes. Also , because I was using a 
    > Barlow lense it is difficult to decide if there is any shape 
    > to the satellite as magnification was 700-800 times , which 
    > is well above the theoretical useable max of the LX90 .
    > However I would like to think that there is a triangular like 
    > structure under the glare. Of course we have no idea what IGS 
    > birds look like , so that presents a bit of a problem.
    It does indeed.
    Analysis of Russell Eberst's observations reveals that IGS 1B is 2.3 magnitudes
    brighter than IGS 1A:
    Note also that IGS 1B's magnitude is uncorrelated with phase angle, as would
    normally be expected of a specular reflecting sphere, which IGS 1B almost
    certainly is not. Apparently it is a complex object.
    Ted Molczan
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