Re: Magnitude estimates on Heavens-Above

From: Anthony Ayiomamitis (anthony@perseus.gr)
Date: Tue Apr 24 2001 - 02:30:16 PDT

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    > Date: Mon, 23 Apr 2001 12:42:42 -0700 (MST)
    > From: Rik Hill <rhill@LPL.Arizona.EDU>
    > To: SeeSat-D@blackadder.lmsal.com
    >
    > Now if you are _constantly_ experiencing differences like these you
    > may want to be sure of the coordinates you are using and/or the offset
    > from the database position from H-A. I just changed the site I was using
    > for my predictions and it did make a noticable difference.
    >
    > -Rik
    
    Rik,
    
         For a brief moment I thought of this as well as a possible explanation and then I remembered that I use precisely the same coordinates for Heavens-Above as well as Rob's programs.
    Therefore, differences in  magnitude between these two sources, for example, would be attributable to the modeling that has been programmed for estimating magnitude. Rob's programs
    provide a much more accurate estimate when I compare with the magnitude that I observe.
    
         Anyway, by no stretch of the imagination is this meant as a criticism of Heavens-Above. They provide a really good service which I consult daily.
    
    Anthony.
    
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