RE: TLE correction?

From: Ted Molczan (molczan@rogers.com)
Date: Tue Mar 30 2004 - 05:20:16 EST

  • Next message: Bjorn Gimle: "Re: TLE correction?"

    Gonzalo Garcia wrote:
    
    > The following two TLE sets were published in two different 
    > days. They have an epoch that is just separated by 3 seconds. 
    > I wonder if anybody knows how often this kind of situation 
    > takes place and what is the reason. Was there anything wrong 
    > with the first set?
    > 
    > COSMOS 2209
    > 1 22112U 92059A   04086.77592796 -.00000269  00000-0  00000+0 0  8483
    > 2 22112   7.3446  60.6105 0003182 351.9302   8.1052  1.00327059 42266
    > COSMOS 2209
    > 1 22112U 92059A   04086.77590236 -.00000269  00000-0  00000+0 0  8479
    > 2 22112   7.3418  60.6334 0001978 336.3594  23.6759  1.00327405 42261
    
    I ran predictions for the object using both elsets, not far from the epoch, and
    found that for a given time, predictions differed by less than 0.04 deg, which
    is not large.
    
    The number 847 elset appears to be more consistent with those issued in recent
    weeks, as appended, but perhaps it was decided to revisit the analysis.
    Significant ongoing perturbations of all of the elements are evident; perhaps
    the recent analyses were judged to have been incorrect. We have too little
    information to judge which of the two elsets is best.
    
    Ted Molczan
    
    1 22112U 92059A   04077.80595918 -.00000293  00000-0  00000+0 0  8461
    2 22112   7.3230  60.6892 0001971 335.8231  24.2945  1.00330643 42179
    
    1 22112U 92059A   04065.84631464 -.00000279  00000-0  00000+0 0  8441
    2 22112   7.2972  60.7699 0001862 337.0819  23.0827  1.00335123 42053
    
    1 22112U 92059A   04061.85974078 -.00000281 +00000-0 +00000-0 0 08465
    2 22112 007.2884 060.7960 0001815 338.1618 021.9671 01.00336650042019
    
    1 22112U 92059A   04059.86647803 -.00000283  00000-0  00000+0 0  8434
    2 22112   7.2840  60.8099 0001790 338.7458  21.3657  1.00337417 41991
    
    1 22112U 92059A   04049.90072704 -.00000304  00000-0  00000+0 0  8423
    2 22112   7.2629  60.8807 0001722 339.4349  20.6995  1.00341252 41893
    
    1 22112U 92059A   04040.93188664 -.00000284 +00000-0 +00000-0 0 08394
    2 22112 007.2440 060.9495 0001544 342.8327 017.3374 01.00344850041806
    
    
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