Obs 15 Nov 2005 Part 2

From: Greg Roberts (grr@iafrica.com)
Date: Thu Nov 17 2005 - 10:54:43 EST

  • Next message: Greg Roberts: "Observations 15 November 2005"

    Observations 15 Nov 2005:
    --------------------------------
    
    Cosatrak 1 (Computerised satellite Tracking System).
    MINTRON low light level CCD surveillance camera (0.005 lux typical
    in non integration mode) and 0.00005 lux in STARLIGHT mode with 128
    frame integration.
    
    Used with 145mm focal length f/2.5 lens,integrating for 96 frames
    which is equivalent to an exposure of 1.92 seconds per image.
    
    Site 0433 : Longitude 18.51294 deg East, Latitude  33.94058 deg S,
    Elevation 10 metres - situated in Pinelands (Cape Town), South Africa
    
    Part 2
    -------
    
    90041 05 775A   0433 F 20051115200649800 56 15 2241046+041815 39  +105 05
    90041 05 775A   0433 F 20051115201103200 56 15 2245063+043427 39  +105 05
    90041 05 775A   0433 F 20051115211853400 56 15 2350323+090743 39  +085 05
    26473 00 047A   0433 F 20051115212215700 56 15 1053412-590810 39  +040 05
    26473 00 047A   0433 F 20051115212233900 56 15 1030263-572008 39  +040 05
    26473 00 047A   0433 F 20051115212255200 56 15 1005267-544357 39  +039 05
    90031 05 546A   0433 F 20051115212603500 56 15 0608129+053418 39  +110 05
    90039 05 689A   0433 F 20051115210049800 56 15 1955330-305342 39  +090 05
    90039 05 689A   0433 F 20051115210147800 56 15 2019287-285157 39  +090 05
    90039 05 689A   0433 F 20051115210307000 56 15 2049540-253745 39  +090 05
    90039 05 689A   0433 F 20051115210459200 56 15 2127300-203120 39  +090 05
    90033 05 558A   0433 F 20051115205709700 56 15 0102013+033525 39  +100 05
    
    
    Strays seen:
    ------------
    
    Titan 3A
    01359 65 034A   0433 F 20051115175807900 56 15 0139499+213515 39  +065 05
    Globalstar M034
    25962 99 062B   0433 F 20051115185938100 56 15 0606133-585108 39  +060 05
    SL-16 R/B
    20625 90 046B   0433 F 20051115190849700 56 15 1100003-705127 39  +045 05
    Breeze-M Debri
    28661 05 019C   0433 F 20051115205345100 56 15 0512531-074415 39  +065 05
    Atlas 2A Centaur at range of 24320 kms
    26389 00 034B   0433 F 20051115211853400 56 15 2351168+090116 39  +085 05
    Eutelsat W5 geostationary
    27554 02 051A   0433 F 20051115212603500 56 15 0612134+051258 39  +115 05
    Intelsat 5-F13 drifting geostationary
    19121 88 040A   0433 F 20051115214121000 56 15 0039287-012917 39  +110 05
    19121 88 040A   0433 F 20051115214142400 56 15 0039494-012751 39  +030 05
    19121 88 040A   0433 F 20051115214418000 56 15 0042234-012438 39  +120 05
    
    Notes:
    ------
    (1) At request of Kevin Fetter some "extra" attention was paid to
        #90041 which he had originally discovered.
    
        When observed at around 20h06m UT I had originally written it
        off as "not seen" but on subsequent checking found that it was
        flashing weakly in a pattern of two successive flashes,then a
        missed flash and then another two flashes etc.Not all flashes
        were of equal brightness and following are observed times
    
        20:06:48.2 - 20:06:49.8 UT weak
        20:07:45.8 - 20:07:48.8 UT bright
        20:08:13.3 - 20:08:14.7 UT weak
        20:09:10.8 - 20:09:12.3 UT bright
        20:09:38.2 - 20:09:39.7 UT weak
        20:10:35.8 - 20:13:37.3 UT bright
        20:11:03.2 - 20:11:04.6 UT weak
    
        The difference between weak and bright flash was probably less than
        one magnitude and the satellite was not seen ( ie fainter than about
        +13) in between flashes. Note the times given are beginning and end
        of the relevant exposure which was 1.92 seconds.
    
        When observed again at around 21h18m UT the flashes were much brighter
        probably around mag +8 or so. The following are the times noted:
    
        21:15:27.2 - 21:15:28.5 UT
        21:16:04.4 - 21:16:05.7 UT
        21:16:51.8 - 21:16:54.4 UT
        21:17:28.9 - 21:17:31.3 UT
        21:18:17.5 - 21:18:18.8 UT
        21:18:53.4 - 21:18:55.9 UT
    
        These times were all read from the DVD recording when the satellite was
        actually visible and one would expect the times visible duration to be
        at least 1.92 seconds - at the moment it escapes me why some are less
        but I think the answer lies in the camera settings.
    
        Light cloud may have been a problem as the camera is operating with
        the electronic light control (ELC) set at 75% of max and Automatic Gain
        control (AGC) set at 75% of max. This means the camera responds to
        background  changes in light levels quite rapidly and with a lot of
        cloud in the image the  exposure can be much shorter. I find these
        settings are best for my sky which varies greatly in background light
        levels due to living in a city with its "glorious" bright sky!
    
    (2) Whilst looking for #90008 I found a bright flasher which I hoped was
        my target but subsequent examination showed that it was Intelsat 5-F13
        This was mainly around magnitude +11 but did a slow flash to about
        magnitude +3 during the three minutes I observed it.
    
    (3) Note to myself --- do a search for #90008 and #90016 which I have
        failed to see recently.
    
    (4) Finally - this particular PC now has a NEW keyboard!
    
    Cheers
    Greg
    
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