Optical 21 Jan 2009 - all

From: Greg Roberts (grr@telkomsa.net)
Date: Thu Jan 22 2009 - 10:29:47 UTC

  • Next message: Kevin Fetter: "re: Optical 21 Jan 2009 - all"

    Observations 21 Jan 2009
    ----------------------------
    
    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.
    
    (1) 145mm focal length f/2.5 lens fitted to 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.
    Image integrated for 2.56 seconds but exposure depends on sky background
    brightness. Field of view 2.5 x 1.9 degrees and showing about mag +12
    stars in "real time". Used as a finder for the 6 inch reflector.
    Individual frames are video time stamped with GPS derived signal.
    
    (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.
    Used with 6 inch f/5 CELESTRON reflector modified to f/2.7 with home
    made corrector lens.Field of view 55 by 40 arc minutes and showing
    15th magnitude stars in real time.
    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
    
    For CLASSFD.TLE:
    ---------------------------
    91132 08 859A   0433 T 20090121185632000 56 15 0518042+055445 39  +125 05
    91132 08 859A   0433 T 20090121190110000 56 15 0522445+055126 39  +120 05
    91132 08 859A   0433 T 20090121190958000 56 15 0531360+054501 39  +120 05
    91132 08 859A   0433 T 20090121192222000 56 15 0544071+053607 39  +120 05
    91132 08 859A   0433 T 20090121193739000 56 15 0559308+052519 39  +120 05
    91132 08 859A   0433 T 20090121194419000 56 15 0606146+052029 39  +120 05
    91140 09 520A   0433 T 20090121184135000 56 15 0612133+081007 39  +105 05
    91140 09 520A   0433 T 20090121185024000 56 15 0620324+080641 39  +105 05
    91140 09 520A   0433 T 20090121195200000 56 15 0718145+073718 39  +095 05
    91140 09 520A   0433 T 20090121195630000 56 15 0722263+073441 39  +095 05
    32287 07 054A   0433 T 20090121200011000 56 15 0522293+054933 39  +115 05
    32287 07 054A   0433 T 20090121202216000 56 15 0544360+053104 39  +105 05
    
    Strays seen:
    ---------------
    BSAT 1B geostationary in graveyard orbit, variable
    25312 98 024B   0433 T 20090121200011000 56 15 0523182+054434 39  +120 05
    BREEZE-M R/B range 12045 kms
    29527 06 051B   0433 T 20090121185116000 56 15 0514491+060946 39  +105 05
    GALAXY 11 very bright geostationary
    26038 99 071A   0433 T 20090121194419000 56 15 0608256+052814 39  +085 05
    INTELSAT 802 geostationary
    24846 97 031A   0433 T 20090121194419000 56 15 0608543+052922 39  +090 05
    SL-16 R/B steady
    27006 01 056F   0433 T 20090121185945300 56 15 0525095+060241 39  +020 05
    ISIS 2 variable
    05104 71 024A   0433 T 20090121190909100 56 15 0531403+060150 39  +065 05
    COSMOS 654
    07297 74 032A   0433 T 20090121201135600 56 15 0537500+051906 39  +050 05
    
    
    Notes:
    --------
    
    (1) Conditions terrible. After a very hot sunny day mist started forming
    shortly after sunset as temperature dropped quite dramatically.Could
    barely see the brighter stars of Orion so reckon I was loosing at least
    two magnitudes. Stopped by solid cloud.
    
    (2) DSP-F23 safely flew past the ASTRA 1 constellation of six satellites
    without mishap as DSP F23 continues drifting eastward. SPACETRACK only
    shows five satellites in the ASTRA 1 constellation whereas there are six.
    
    (3) #91132 very difficult due to mist(whatever). Without using the 6inch
    reflector I would not have been able to see it.
    
    (4) I think Ill take a rest tonight and catch up on some other matters
    that need attending to - besides its cloudy at the moment anyway.
    
    Cheers
    Greg
    
    
    
    
    
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