Re: NROL-20: revised search elements

From: Cees Bassa (cbassa@gmail.com)
Date: Thu Oct 20 2005 - 16:33:29 EDT

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    Hello list,
    
    If NROL-20 (USA 186, #28888, 2005-042A) or its rocket was in the
    second elset below, it would have been briefly visible from my
    location at 19:38 UT. I used my digital camera to monitor the general
    area (50x33 deg) from 19:29 to 19:59 UT with 1 minute exposures.
    Though some clouds passed during this time, the images show no
    satellite trails. From images I took of Lacrosse 5, I estimate that I
    would have seen anything brighter than mag 3.
    
    Regards,
        Cees Bassa
    
    Culemborg, The Netherlands
    
    On 10/20/05, Ted Molczan <seesat@rogers.com> wrote:
    > There are two possible solutions for any given altitude at SECO. I believe that
    > the argument of perigee of the first elset (137 deg) probably is closest to
    > being correct, because it is closest to that of the spacecraft being replaced,
    > USA 129 (96072A / 24680), which was at arg perigee 117.4 deg at the time of
    > launch.
    >
    >                                                         175 X 1029 km
    > 1 72001U          05292.75993057  .00807205  00000-0  10000-2 0    01
    > 2 72001  97.8760 354.5813 0611200 137.5000  23.0000 14.87728598    08
    >
    >                                                         175 X 1029 km
    > 1 72001U          05292.75993056  .00807205  00000-0  10000-2 0    00
    > 2 72001  97.8760 354.5813 0611200 189.0000 337.4000 14.87728598    02
    
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