Optical 18th May 2013

From: Greg Roberts (grr@telkomsa.net)
Date: Sun May 19 2013 - 13:42:46 UTC

  • Next message: Ted Molczan: "RE: Possible reentry captured over Chile ?"

    Observations 18 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:
    ---------------------------
    21775 91 076A   0433 G 20130518195946452 16 15 1302554+344612 58
    21775 91 076A   0433 G 20130518200504696 16 15 1327284+261514 48
    21775 91 076A   0433 G 20130518200511292 16 15 1328019+260305 88
    21775 91 076A   0433 G 20130518200517888 16 15 1328363+255038 18
    21775 91 076A   0433 G 20130518200524455 16 15 1329103+253818 58  +139 09
    25669 99 017A   0433 G 20130518172625871 16 15 0615493+011511 97  +116 01
    25669 99 017A   0433 G 20130518172750942 16 15 0616310+010842 97  +117 02
    25669 99 017A   0433 G 20130518172856159 16 15 0617039+010355 77  +113 02
    25669 99 017A   0433 G 20130518173020307 16 15 0617471+005752 58  +133 06
    25669 99 017A   0433 G 20130518173253709 16 15 0619016+004612 28
    25669 99 017A   0433 G 20130518173352512 16 15 0619301+004212 19
    25724 99 023A   0433 G 20130518172034276 16 15 0655419+050401 99
    25724 99 023A   0433 G 20130518172125940 16 15 0734440+035845 28
    25724 99 023A   0433 G 20130518172216271 16 15 0822512+024815 28
    25724 99 023A   0433 G 20130518172306443 16 15 0921100+013336 28
    28054 03 048A   0433 G 20130518164439966 16 15 2204375-800119 48
    28054 03 048A   0433 G 20130518164442523 16 15 2209578-802258 29
    28054 03 048A   0433 G 20130518164445093 16 15 2215327-804342 38
    28054 03 048A   0433 G 20130518164447667 16 15 2221400-810425 38
    28054 03 048A   0433 G 20130518164551647 16 15 0507106-820124 29
    28384 04 034A   0433 G 20130518184039924 16 15 0939411+041533 28  +120 02
    28384 04 034A   0433 G 20130518184054972 16 15 0941300+044625 19
    28384 04 034A   0433 G 20130518184111858 16 15 0943295+052025 58  +083 00
    28384 04 034A   0433 G 20130518185040938 16 15 1030420+192008 18
    28384 04 034A   0433 G 20130518185103512 16 15 1032017+194423 18  +090 00
    28384 04 034A   0433 G 20130518185121335 16 15 1033039+200319 28
    28385 04 034B   0433 G 20130518190447111 16 15 0525376-500627 78  +146 18
    28385 04 034B   0433 G 20130518190511182 16 15 0528315-501243 29
    28385 04 034B   0433 G 20130518190915973 16 15 0600007-510023 38  +143 08
    28385 04 034B   0433 G 20130518190936608 16 15 0602393-510246 29  +118 08
    28385 04 034B   0433 G 20130518190956964 16 15 0605117-510441 28  +151 56
    28385 04 034B   0433 G 20130518191017806 16 15 0607482-510633 58  +145 13
    28646 05 016A   0433 G 20130518171321940 16 15 0500572-584405 28
    28646 05 016A   0433 G 20130518171324017 16 15 0459392-592701 69
    28646 05 016A   0433 G 20130518171326094 16 15 0458191-600833 38
    28646 05 016A   0433 G 20130518171404266 16 15 0415471-721657 28
    28646 05 016A   0433 G 20130518171406361 16 15 0411540-725252 28
    28646 05 016A   0433 G 20130518171408444 16 15 0407452-732820 28
    28646 05 016A   0433 G 20130518171438565 16 15 0221446-802641 28
    28646 05 016A   0433 G 20130518171440646 16 15 0209436-804615 28
    28646 05 016A   0433 G 20130518171442734 16 15 0157017-810352 28
    29522 06 050A   0433 G 20130518162312463 16 15 1517596-494320 38
    29522 06 050A   0433 G 20130518162315025 16 15 1515131-492738 88
    29522 06 050A   0433 G 20130518162317590 16 25 1512356-491095 39
    29522 06 050A   0433 G 20130518162320162 16 15 1509282-485345 58
    29522 06 050A   0433 G 20130518162356232 16 15 1430016-435414 38
    29522 06 050A   0433 G 20130518162358802 16 15 1427168-432833 39
    29522 06 050A   0433 G 20130518162434636 16 15 1349590-361915 48
    29522 06 050A   0433 G 20130518162437197 16 15 1347259-354346 29
    29522 06 050A   0433 G 20130518162525836 16 15 1302439-224619 29
    29522 06 050A   0433 G 20130518162528401 16 15 1300360-220108 38
    32288 07 054B   0433 G 20130518185701634 16 15 1104497+061606 17  +123 01
    32288 07 054B   0433 G 20130518185912986 16 15 1106551+061805 28  +120 04
    32288 07 054B   0433 G 20130518185937066 16 15 1107184+061819 47  +118 01
    32288 07 054B   0433 G 20130518190008077 16 15 1107488+061822 18  +117 01
    35815 09 047A   0433 G 20130518181512291 16 15 1314571+052532 67
    35815 09 047A   0433 G 20130518181558465 16 15 1315435+052530 37  +111 01
    35815 09 047A   0433 G 20130518181628263 16 15 1316134+052529 87  +112 01
    39025 12 071A   0433 G 20130518170747904 16 15 0553383+012846 19
    39025 12 071A   0433 G 20130518170749976 16 15 0554349+010324 78
    39025 12 071A   0433 G 20130518170752056 16 15 0555314+003752 28
    39025 12 071A   0433 G 20130518170823258 16 15 0612469-072200 38
    39025 12 071A   0433 G 20130518170825328 16 15 0614097-080049 39
    90046 05 864A   0433 G 20130518182127845 16 15 1732525-783003 38  +105 03
    90046 05 854A   0433 G 20130518182230702 16 15 1914476-705901 28  +097 01
    96044 96 554A   0433 G 20130518191759198 16 15 1422166-060204 28
    96044 96 554A   0433 G 20130518192138151 16 15 1425564-061326 28  +146 02
    96044 96 554A   0433 G 20130518192342962 16 15 1427511-061919 28
    
    STRAYS SEEN:
    ---------------------
    21111 91 010A   0433 G 20130518180804484 16 15 1516549+005938 38  +127 91
    21111 91 010A   0433 G 20130518181022512 16 15 1519099+005130 68  +118 04
    25740 99 027A   0433 G 20130518181512291 16 15 1313070+052408 67  +104 00
    25740 99 027A   0433 G 20130518181558465 16 15 1313533+052408 37  +103 00
    25740 99 027A   0433 G 20130518181628263 16 15 1314231+052407 87  +104 01
    26590 00 068A   0433 G 20130518181512291 16 15 1315275+052652 67  +116 01
    26590 00 068A   0433 G 20130518181558465 16 15 1316140+052651 37  +116 01
    26590 00 068A   0433 G 20130518181628263 16 15 1316438+052651 87  +115 01
    39079 13 006B   0433 G 20130518181512291 16 15 1319530+052650 67  +094 00
    39079 13 006B   0433 G 20130518181558465 16 15 1320392+052650 37  +094 00
    39079 13 006B   0433 G 20130518181628263 16 15 1321090+052650 87  +094 00
    
    NOTES:
    ------
    
    (1) Decided to see if APEX could be used to reduce observations of LEO
        satellites. Appeared to do this with no problems at all - ie it
        processed all images even when the satellites were somewhat off in
        time. I checked about 40% of the leo sats by measuring manually and
        choosing leo sats at random and got the same answers - in fact with
        satellites running "off time" I  took the APEX derived position and 
    displayed
        it in GUIDE overlaying the  trace of the CCD image and they matched 
    perfectly
        so I am reasonably  confident that APEX can be used for LEO sats.
        Lets see what Mike  or Ted have to say when reducing the obs ....
       Would  be nice if APEX  can be used with confidence for leo sats.
    
    (2) 96044 seen again- this time used 60 second exposures and guiding on
        predictions. Then quite easy to see but not visible when using my
        usual 10-20 second exposures with camera stationary so the satellite
        is variable with magnitude fainter than +15.
    
    (3) One problem with using APEX for processing LEO satellites- the
        magnitude obtained is wrong by about 3-4 magnitudes (fainter) since
        APEX assumes the satellite image is an integrated image whereas the leo
        sat image is a trailed exposure. Consequently I have removed the
        magnitude of the LEO sats in this report.
    
    (4) USA 227 not seen so has moved. My rather erratic memory seems to
        recall that it was decided that this has been moved outside my "sky"
        to its new location.
    
    (5) Tried to find FLEETSATCOM 7 but even with long exposures and tracking
        on the predicted (int) position nothing seen. However low elevation so
        poor sky conditions.
    
    Cheers
    Greg
    
    
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    This archive was generated by hypermail 2b29 : Sun May 19 2013 - 13:46:25 UTC