ISS mag -4.5 ?????

From: John Locker (
Date: Sun Aug 12 2007 - 09:06:56 EDT

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    I see that my CalSky predicted pass for ISS tonight ( 52 degs ) is forecast 
    as -4.5 mag  !
    I suspect we wont see that , but wondered why the sudden increase.......
    Adding Endeavour to the complex doesnt usually increase brightness any. 
    ...   but I am wondering if the programme has simply computed the sum of the 
    magnitude of the two individual vehicles.
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