Precision aerobatics ?

From: John Locker (john@satcom.freeserve.co.uk)
Date: Sat Apr 03 2004 - 03:25:54 EST

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    Hi all ,
    
    I have been doing a bit of math(s)  on the images of the SES Astra fleet at
    19 degs east.
    Assuming the FOV is 30 arc minutes , the "cube" within which the operators
    must keep their spacecraft is about 12 arc minutes on each side. An on slot
    distance of 140 km .
    
    
    Thats fine if you only have one bird to station keep , but SES have seven to
    manoeuvre !
    
    http://mysite.freeserve.com/satcom_transits/box.gif  ( 2 Mb )  shows just
    how good a job they do.
    Its a tribute to the expertise of SES's controllers  that they have never
    violated their "airspace".
    Thats some precision flying !
    
    Regards,
    
    John
    
    http://www.satcom.freeserve.co.uk/
    
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