Obs 29 April and 4th May 2013

From: Greg Roberts (grr@telkomsa.net)
Date: Wed May 08 2013 - 07:55:26 UTC

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    Observations 29 APRIL and 04 MAY 2013
    -----------------------------------------------
    
    Cosatrak 1 (Computerised satellite Tracking System).
    
    FLI ML8300M CCD camera with mechanical shutter + Trimble GPS
    
    Used with 102mm aperture f/5 SKYWATCHER refractor.
    Field of view 123 x 93 arc minutes.
    Image scale 8.86 arc sec/pixel.
    Images processed and measured with APEX.
    
    Site 0433 : Longitude 18.51294 deg East, Latitude -33.94058 deg,
    Elevation 10 metres-situated in Pinelands (Cape Town),South Africa
    
    FOR CLASSFD.TLE:
    ---------------------
    35815 09 047A   0433 E 20130429173532453 16 15 1120178+053241 18  +120 02
    35815 09 047A   0433 E 20130504165259293 16 15 1057248+052939 77  +130 03
    
    STRAYS SEEN:
    -----------------
    14115 82 093F   0433 E 20130429173532453 16 15 1120092+053641 38  +134 05
    25740 99 027A   0433 E 20130429173532453 16 15 1118313+052739 97  +110 02
    25740 99 027A   0433 E 20130504165259293 16 15 1055244+052532 77  +116 01
    26590 00 068A   0433 E 20130429173532453 16 15 1120469+052859 18  +127 14
    26590 00 068A   0433 E 20130504165259293 16 15 1057471+052719 77  +133 01
    
    NOTES:
    ----------
    (1) As a result of Ian Roberts reporting that PAN was near INTELSAT 12
        I reexamined my observations made on the 29th April and on the 4th
        May and found that I had observed PAN on both occassions - the first
        time I misidentified it and in the case of the 4th May I failed to
        mark PAN and INTELSAT 12 for measuring(!) - I only see a part of the
        image when I mark geosats for measuring as the image is too big for
        the computer monitor and only marked NIMIQ 1.
    
        Herewith are the amended observations which confirm Ians discovery.
        I make PAN between NIMIQ 1 and INTELSAT 12.
    
        If I had been more careful/alert I could have saved myself a great
        deal of unnecessary work !!!
    
    (2) Now as to my report that PAN was near YAMAL 404 - this is a real
        mystery.   In the image taken on the 29 April there were only 4
        satellites in the cluster - SPACETRACK predicted 5 - no sign of
        GSAT 8.  However on the 4th May there were 5 satellites so naturally
        I suspected PAN whereas it turns out it was GSAT 8- so where was
        GSAT 8 on the 29th ? All five satellites are bright geostationaries
        and none were near eclipse. I have observed GSAT 8 on quite a few
        occassions and it has never shown signs of variability so what
        happened on the 29th April ?
    
    Cheers
    Greg
    
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