Re: USA 136 rocket

From: Björn Gimle (b_gimle@algonet.se)
Date: Wed May 19 2004 - 13:16:56 EDT

  • Next message: Ted Molczan: "Updated USA 129 elements"

    In case it is still orbiting, it could pay off to search for it.
    At 35S it could be seen low in the SE in the morning twilight,
    soon after perigee.
    If it still has a high perigee it would pass higher or earlier,
    and the chances of witnessing the decay improves.
    
    OIG had elsets and decay predictions for USA 153 Centaur, but nothing for
    USA 136 Centaur yet.
    
    On DOY 125.0 (?) Mike "was very lucky to find it after searching for
    only 45 minutes." and predicted drag .09 for 126.0
    On DOY 128.0 (?) he "failed to find it sarching about
    45 minutes early to about 30 minutes late."
    The most recent elset I found was
    USA 136 CentRk
    1 25035U 97068B   04126.04620462 0.06500000  00000-0  10667-2 0    08
    2 25035  63.5359  24.1290 6463648 247.7621  34.6012  3.51153652    09
    Assuming >45 min early after two days, the error could have grown
    to 12h on my first clear night last Friday.
    Predictions are quite useless, but I selected a few higher ndot2
    and used SatEvo to generate orbits with decay May 20-28.
    I had to remove/reduce the drag terms and used SGP to make SkyMap
    predict anything. They may give an idea on where to search.
    
    USA 136 r .11                    2.8             1603 x 84 km
    1 25035U 97068B   04139.09657634  .00000000  26044-1  29255-2 0 90007
    2 25035  63.3627  13.2378 1052068 247.7090 100.8115 14.14696364   841
    USA 136 r .105                   2.7             1606 x 84 km
    1 25035U 97068B   04139.71739935  .00000000  23460-1  27956-2 0 90005
    2 25035  63.3628  12.7210 1053480 247.7066 100.7982 14.14350588   883
    USA 136 r .098                   3.6             1139 x 81 km
    1 25035U 97068B   04140.81202213  .00000000  52815-2  27201-2 0 90000
    2 25035  63.3354  11.5390 0756659 247.7051 104.1030 14.86128036   967
    USA 136 r .095                   1.6             2307 x 87 km
    1 25035U 97068B   04140.91459499  .00000000  66509-2  24671-2 0 90009
    2 25035  63.4104  12.1819 1465567 247.6983  96.1414 13.16894972   948
    USA 136 r .065                                   9967 x 88 km
    1 25035U 97068B   04141.01143721  .22675983  92692-2  11564-2 0 90007
    2 25035  63.5107  16.2237 4330749 247.7072  61.5513  7.12774945   747
    
    
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