Re: message from space track regarding bulk tle file

From: Marco Langbroek (marco.langbroek@online.nl)
Date: Fri Aug 24 2012 - 15:28:51 UTC

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    satrack@libero.it wrote:
    
    > I think the best solution is to develop a program that connects
    > to the website, downloads only the new TLEs and reconstruct
    > locally the complete catalog updating the old one.
    
    Plus, I'd wish to suggest, it will need to save the complete old version of the 
    file for archive purposes. Simply updating a file to make it current, is not 
    enough. Some of us (e.g. me) want to be able to go back and pull a full 
    catalogue file out of the archive for a date significantly in the past.
    
    For example: a fellow amateur sends me a picture taken five months ago, on March 
    25. He asks me to identify a satellite visible on it.
    
    A complete tle set up to date to today (August 24) will be of *no use* for this 
    purpose. The tle epochs are too far out (they'll be for August 23-24, not March 
    23). I'll need a complete tle catalogue with epochs valid for (within a few days 
    of) March 25.
    
    Because I currently periodically archive the bulk download files from 
    Space-track, I actually can. I can go to my download archive and pull the 
    downloaded file "catalogue_3l_2012_04_23_am.txt.gz" from March 23, which is 
    close enough to March 25 to be usefull *and will contain tle's of all objects of 
    that moment, with an appropriate tle epoch*.
    
    - Marco
    
    -----
    Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
    e-mail: sattrackcam@langbroek.org
    
    Cospar 4353 (Leiden):   52.15412 N, 4.49081 E (WGS84), +0 m ASL
    Cospar 4354 (De Wilck): 52.11685 N, 4.56016 E (WGS84), -2 m ASL
    Station (b)log: http://sattrackcam.blogspot.com
    Twitter: @Marco_Langbroek
    -----
    
    
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