Re: Questions regarding Shuttle/ISS visibility after undocking

From: Skywayinc@aol.com
Date: Tue Jun 19 2007 - 01:13:45 EDT

  • Next message: Ed Cannon: "Uh, unid..."

    In a message dated 6/18/2007 9:16:21 AM Eastern Daylight Time,  
    Bill_T_Bard@raytheon.com writes:
    
    Also, I think the shuttle will stop advancing away from the station when  
    it's 40 to 70 miles in front until they do their late inspection of the  
    wing leading edges and nose. I think the past flight or two, the station  
    has been able to watch the re-entry of the shuttle since they're not too  
    far away when they de-orbit.
     
    --------------------------------------------------------------------
    If what Bill says is true, then the separation between the two vehicles can  
    be estimated
    roughly using this simple formula: 
     
                                                                 S                
    A =angular separation (degrees) = 57.3   ---
    D
     
    Where S = the separation distance in statute miles between the Shuttle  & ISS 
    and 
    D = the distance of the two vehicles in statute miles above the Earth's  
    surface.
     
    Assuming the ISS and Shuttle are at a similar height of 218 statute miles,  
    then
    for a linear separation of 40 statute miles, the apparent angular  separation
    as seen from the ground would be 10.5, while a linear separation  of 70 
    miles 
    would yield 18.4.  So quite unlike the situation from last  December, where 
    upon
    separation ground based observers saw the Shuttle and ISS exceedingly 
    close together, they should appear well separated on Tuesday  and Wednesday
    nights.
     
    -- joe rao    
    
    
    
    
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