Re: Calculating Magnitude

From: Paolo Cosetti (paolo.cosetti@iol.it)
Date: Tue Aug 29 2000 - 09:43:33 PDT

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    At 12.10 29/08/00 -0400, you wrote:
    >I'm looking for a formula to "roughly" calculate magnitude for my
    >satellite tracking program. I realize magnitude is dependent on many
    >different factors but want a "semi-quantitative" value at least to be
    >able to "filter" objects that would be reasonably visible. Thanks for
    >any help.
    >
    >Brent Boshart
    
    Hi Brent,
    you can use this classic formula:
    
    mag = stdmag - 15.75 + 2.5 * log10 (range * range / fracil)
    
    where stdmag = satellite standard magnitude ( at 1000km range, 50% 
    illuminated )
    range = distance from observer to satellite (km)
    fracil = fraction of satellite illuminated ( 0 <= fracil <=1 ).
    
    Check the following document: "Description of data in the Molczan file" 
    (Ted Molczan)
    
    Regards,
    
    Paolo Cosetti
    
    
    
    Web site:
    http://users.iol.it/paolo.cosetti
    http://members.xoom.it/poldino
    
    ACME I-MI-06 / TRA #08249 Level 1
    
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