Optical 21 Dec 2008 more

From: Greg Roberts (grr@telkomsa.net)
Date: Fri Dec 26 2008 - 08:30:19 UTC

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    Observations 21 December 2008(more)
    --------------------------------------------------
    
    Cosatrak 1 (Computerised satellite Tracking System).
    Camera mount now carries two systems that can be operated
    together as two totally different sytems and computers used.
    Generally the DSI Pro II camera will be used for high altitude
    slow moving objects. Tests seem to indicate that its sensitivity
    is comparable to the MINTRON ( possibly better) but as its not
    possible (?) to time stamp to better than 1 second accuracy the
    time resolution is not good enough for LEO objects.
    
    
    (2)Meade DSI Pro II Monochrome CCD camera without filters.
    using integration times of 20 sec min to 60 seconds maximum
    depending on brightness of sky in particular area.No image
    processing done but dark field applied.
    Used with 200mm focal length f/2.8 Nikkon telephoto lens,
    field of view 1.88 x 1.40 degrees. Can get to magnitude 13
    or so in less than 20 seconds exposure.
    Exposure time to nearest second inserted into image FITS header
    from PC clock which is automatically checked every minute against
    GPS signal.
    
    Site 0433 : Longitude 18.51294 deg East, Latitude -33.94058 deg,
    Elevation 10 metres-situated in Pinelands (Cape Town),South Africa
    
    
    Strays seen:
    -------------
    ASTRA 1M geostationary
    33436 08 057A   0433 G 20081221190534000 56 15 0326066+052556 39  +100 05
    SIRIUS 2 geostationary
    25049 97 071A   0433 G 20081221190534000 56 15 0321234+052459 39  +110 05
    COSMOS 2318 (GLONASS)
    23622 95 037C   0433 G 20081221191301000 56 15 0330366+052758 39  +120 05
    
    Notes:
    -------
    (1) Apparently missed reporting these - nothing dramatic :-))
    
    Cheers
    Greg
    
    
    
    
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