differences - HeavensAbove and Heavensat

From: jpc (jpceir1@eircom.net)
Date: Sat Dec 15 2007 - 13:59:33 UTC

  • Next message: Björn Gimle @GlocalNet: "Re: differences - HeavensAbove and Heavensat"

    Comparing predictions using HeavensAbove, and, eg Heavensat, the 
    predicted track and times seem to vary widely.
    
    For example, a pass of the ISS this evening is predicted by HeavensAbove 
    to pass through Cassiopeia, whereas Heavensat shows it passing outside 
    the constellation, to the north. The timing by HeavensAbove is given as 
    1757 - 1803, whereas Heavensat gives me 1757 - 1806. This latter could 
    be due to different definitions of elevation.
    
    However the track is very different. Fine for visual obs, but rather 
    problematic for precise telescope/camera pointing.
    
    Or am I missing something?
    
    Joe
    
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