anomalies - in orbit or not?

From: wkitty42@gmail.com
Date: Mon Dec 23 2013 - 23:58:56 UTC

  • Next message: Jonathan McDowell: "Re: anomalies - in orbit or not?"

    i've recently noted some anomalies with the various satellite catalogs and the 
    TLEs that are available from numerous sources... mainly the catalogs list 
    certain objects as no longer in orbit but we're (still) getting (updated) TLEs 
    for those objects... the list is not very large which is a good thing :)
    
    the following is the list of objects listed as "down" (indicated by a '!' 
    prefixing their common name by my software) followed by their TLE epoch, decoded 
    epoch date and time and finally their calculated perigee, apogee and inclination 
    all from the current TLE available for the object...
    
    30381 !deb FY-1C        13354.47007591 2013-12-20 11:16:54  PxAxI:     844 x 936 
         x  99.1283
    38903 !deb Briz-M       13329.37286169 2013-11-25 08:56:55  PxAxI:     189 x 301 
         x  50.0250
    38932 !deb Briz-M       13330.25932910 2013-11-26 06:13:26  PxAxI:     226 x 663 
         x  49.0853
    38938 !deb Briz-M       13338.01705126 2013-12-04 00:24:33  PxAxI:     147 x 211 
         x  49.8638
    38939 !deb Briz-M       13330.28021302 2013-11-26 06:43:30  PxAxI:     220 x 371 
         x  50.4593
    38852 !Raiko            13218.07382584 2013-08-06 01:46:18  PxAxI:     140 x 146 
         x  51.6160
    34539 !deb Iridium 33   13333.80484043 2013-11-29 19:18:58  PxAxI:     323 x 378 
         x  86.2908
    35922 !deb Iridium 33   13354.53423095 2013-12-20 12:49:17  PxAxI:     724 x 778 
         x  86.3970
    36489 !deb Iridium 33   13355.11121650 2013-12-21 02:40:09  PxAxI:     726 x 755 
         x  86.4311
    33827 !deb Kosmos-2251  13339.61352369 2013-12-05 14:43:28  PxAxI:     195 x 201 
         x  73.8887
    34632 !deb Kosmos-2251  13335.29792227 2013-12-01 07:09:00  PxAxI:     270 x 293 
         x  73.9437
    35458 !deb Kosmos-2251  13327.71081875 2013-11-23 17:03:34  PxAxI:     310 x 349 
         x  73.8973
    35994 !deb Kosmos-2251  13328.43398149 2013-11-24 10:24:56  PxAxI:     337 x 371 
         x  73.9768
    37290 !deb Kosmos-2251  13328.93122941 2013-11-24 22:20:58  PxAxI:     326 x 418 
         x  73.9152
    
    what is the accepted policy by the group when dealing with situations like this? 
    is there one? should the maintainer of the TLEs be notified or the owner of the 
    object? i'm only wanting to try to ensure that the most accurate information is 
    available for those using satellite catalogs and various TLE sets...
    
    and yes, i did also run square into the NOSS 2-1B and E object situation :LOL: 
    after some discussion and research, i decided to override their entries in my 
    catalog so as to indicate that the tracking and TLEs are being done by the 
    classfd maintainers... in this way, objects that are being actively tracked 
    won't be left out because of a difference of identification number assignments 
    from 20+ years ago :)
    
    as far as that goes, i did see this with three or four objects that are listed 
    in classfd...
    
    i also noticed that an object listed in classfd was not listed a few days ago... 
    i don't (yet) know if this object was simply missed in the recent classfd 
    generating or if the object is actually down and no one has listed it as down in 
    any available catalogs... the last orbit i see for the object looks fairly 
    stable and not low enough for it to have decayed but it is possible that it was 
    actively deorbited by the owner or came down for some other reason...
    
    -- 
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