Optical 25 Jan 2012 Part 2

From: Greg Roberts (grr@telkomsa.net)
Date: Fri Jan 27 2012 - 13:54:38 UTC

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    Observations 25 JAN 2012 Part 2
    --------------------------------------------
    
    Cosatrak 1 (Computerised satellite Tracking System).
    
    FLI ML8300M CCD camera with mechanical shutter + Trimble GPS
    
    Used with NIKON ED AF NIKKOR 80-200mm f/2.8 telephoto lens
    set at 200mm focal length. Field of view 5.2 x 3.8 degrees,
    image scale 23.0 arc sec/pixel.
    These images processed and measured manually.
    Time is accurate to within 50 milliseconds.
    
    Site 0433 : Longitude 18.51294 deg East, Latitude -33.94058 deg,
    Elevation 10 metres-situated in Pinelands (Cape Town),South Africa
    
    FOR CLASSFD.TLE:
    ---------------------
    21775 91 076A   0433 F 20120125192031599 55 15 0145463-244604 39
    21775 91 076A   0433 F 20120125192127570 55 15 0149216-293605 39
    21775 91 076A   0433 F 20120125192204847 55 15 0151497-325844 39
    21775 91 076A   0433 F 20120125192235893 55 15 0153589-355555 39
    20691 90 050C   0433 F 20120125201210515 55 15 1506238-855210 39
    29250 06 027B   0433 F 20120125211145940 55 15 0435470-683816 39
    29250 06 027B   0433 F 20120125211552399 55 15 0735207-391939 39
    
    UNKNOWNS:
    --------------
    No 1:
    99999 99 999A   0433 F 20120125202907984 55 15 1408233-613119 39  +070 05
    99999 99 999A   0433 F 20120125203120640 55 15 1412539-614143 39  +070 05
    99999 99 999A   0433 F 20120125203137485 55 15 1413317-614143 39  +070 05
    99999 99 999A   0433 F 20120125203158547 55 15 1414189-614219 39  +070 05
    99999 99 999A   0433 F 20120125203229019 55 15 1415157-614216 39  +070 05
    
    No 2:
    99990 99 990A   0433 F 20120125205808282 55 15 1418538-571417 39  +055 05
    99990 99 990A   0433 F 20120125205809493 55 15 1419116-570114 39  +055 05
    99990 99 990A   0433 F 20120125205812493 55 15 1419137-562732 39  +055 05
    
    STRAYS SEEN:
    --------------
    COSMOS 586
    06828 73 065A   0433 F 20120125214332728 55 15 0212530-273432 39  +076 05
    SL-3 R/B
    08520 75 124B   0433 F 20120125203241659 55 15 1406564-625050 39  +060 05
    SL-8 R/B
    15032 84 056B   0433 F 20120125193649567 55 15 0142043+112427 39  +052 05
    DL-8 R/B
    32053 07 038B   0433 F 20120125214641967 55 15 2043405-730607 39  +065 05
    SL-14 R/B
    17588 87 026G   0433 F 20120125193629420 55 15 0131218+105853 39  +069 05
    SL-8 R/B
    18986 88 023B   0433 F 20120125194040112 55 15 0137406+065942 39  +065 05
    COSMOS 1598
    15292 84 100A   0433 F 20120125200621921 55 15 0622230-731024 39  +065 05
    TOPEX/POSEIDON
    22076 92 052A   0433 F 20120125211114521 55 15 0307240-711321 39  +065 05
    COSMOS 1796
    17140 86 092C   0433 F 20120125211525702 55 15 0739244-421411 39
    IRIDIUM 53
    25173 98 010E   0433 F 20120125201438315 55 15 1505392-753155 39  +072 05
    
    NOTES:
    --------
    (1) Continuation of processing observations from 25 January 2012. Still
        have a few to sort out:-((((.
    
    (2) Two unknowns found. The one I called No 1 is high altitude so slow
        moving.Not a place where one would normally find such a satellite so
        Im not terribly convinced its real as the telephoto lens is known for
        internal reflections ( has 19 lens surfaces inside it!) . It looks
        like a satellite though. There were no obvious bright stars in the
        field of view to cause an internal reflection.
    
    (3) The second one - Number 2 - is real and was captured in two exposures.
        Appeared steady in both exposures
    
        I cannot find a match for either object in my element database.
    
    (4) The new leo tracking setup works a bit too well! A 3 second exposure
        at high elevations shows stars down to between magnitude 15 and 16.
        Closer to the horizon ( and city light pollution) it gets down to
        about magnitude 12 or 13. As a rule of thumb I normally take the leo
        satellite magnitude limit as about 4 magnitudes brighter - ie zenith
        limit will be about mag 10 to 11 and lower elevations about mag 9-- 
        just as well I dont have a dark country sky - all the satellites would
        drive me insane ! If I use the system in autotrack mode I can gain about
        2 magnitudes on most satellites.
    
    Cheers
    Greg 
    
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