Re: Hook Line and Sinker

From: John A. Dormer 2 (jad@texas.net)
Date: Tue Mar 17 2009 - 05:03:05 UTC

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    Ok, so I'm slow to chime in, but being an old Unix guy I wanted to share
    this piece to make it easier if you have access to a *NIX system, a
    Linux box, or a Windows system with the "unixtools" package.
    
    This simple command-line script will show the sorted list of objects
    from oldest to newest in any TLE file:
    
        grep '^1' classfd.tle | cut -c3-8,18-32 | sort -k2 -n
    
    The script reads "get every line starting with a one at the beginning
    from classfd.tle. Pipe this into `cut` and print the characters in
    positions three through eight and 18 to 32. Pipe this into `sort`, using
    the second field and sort on it numerically."
    
    While the full file currently has 280 vehicles in it, this is the
    beginning of the output. It is from Mike McCants' classfd.tle from 0500
    16 March 2008 CDT, and represents the very oldest 14 vehicles in the file:
    
    90059U 06320.93910488
    11852U 07037.75716387
    90061U 07048.80870443
    90057U 07061.96014410
    90047U 07130.72731785
    14139U 07163.64774262
    30588U 07224.01907183
    90062U 07240.48781203
    90076U 07261.14212025
    90020U 07306.84635606
    26356U 08066.83903380
    96027U 08098.39106334
    96085U 08100.69892177
    90080U 08181.08833312
    
    This shows some vehicles are probably going to be quite challenging to
    recover since their last updates were at the end of 2006 and the early
    part of 2007.
    
    Of course, this doesn't distinguish between LEO, MEO and GEO vehicles.
    The formulas given by Greg Roberts in his recent message "Re: OT:
    Orbital Radius / Semi-major Axis" might be of use here, but numeric
    processing in the shell means a bigger script. :)
    
    The "unixtools" package for Windows systems will allow the above:
    
    	http://unxutils.sourceforge.net/
    
    I'm pretty sure that the Command Line in Windows will allow stringing
    together multiple pipes without complaint.
    
    	John
    
    Derek C Breit wrote:
    > I should have been a bit more long winded in my explanation of how to select
    > what to observe. After you have combined the CLASSFD.TLE, INTTLE.TLE and 
    > INT96.TLE files have a look at the high objects in CLASSFD.TLE to see when
    > they were last observed.
    
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