RE: Problems with norad

From: Ted Molczan (molczan@rogers.com)
Date: Sun May 08 2005 - 20:22:17 EDT

  • Next message: Ted Molczan: "TJM obs of 2005 May 09 UTC"

    Javi wrote:
    
    > My skymap when check the full catalog downloaded from 
    > spacetrack updated makes me a warning:
    > 
    > ECC or MM out of range (Tle updated?) with NORAD #28587
    > 
    > Same with Norad #28635
    > 
    > What is the problem with these satellites? What is the 
    > meaning of this error?
    
    I am not very familiar with Skymap, but since the out-of-range elements are
    eccentricity or mean motion, I suspect the cause is old elements of objects that
    were close to decay. 
    
    Space-Track's full-catalog files include the latest elements issued within the
    past 30 days, so they more than likely contain quite a few objects that have
    decayed within the past 30 days.
    
    Propagating elements of such objects to the present is likely to in unrealistic
    values of eccentricity or mean motion.
    
    I suspect that unless you are interested in those objects, you can ignore the
    warning.
    
    Ted Molczan
    
    
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