RE: STS-127 ascent visibility

From: Ted Molczan (ssl3molcz@rogers.com)
Date: Sun Jun 14 2009 - 01:33:50 UTC

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    Sean Sullivan wrote:
    
    > It seems probable that the next STS-127 launch attempt will 
    > be on June 20 (presuming that LRO keeps its slot on the
    > Eastern Test Range).  This would produce a night launch, with
    > a window approximately 4:30 to 4:35 EDT.  In Florida, this is
    > before astronomical twilight.  From my location in Massachusetts,
    > it's right at the start of civil twilight.
    > 
    > Does anyone know if the shuttle's flight trajectory would break into 
    > sunlight during ascent, and if so, when that would happen during the 
    > launch?
    
    Assuming launch at 08:31:00 UTC, I estimate exit from the umbra at 08:38:42, 103
    km above 35.17	N, 71.79 W. It would exit the penumbra 9 s later.
    
    Ted Molczan
    
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