Optical 28 Jan 2013

From: Greg Roberts (grr@telkomsa.net)
Date: Tue Jan 29 2013 - 09:43:19 UTC

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    Observations 28 JAN 2013
    ------------------------------------
    
    Cosatrak 1 (Computerised satellite Tracking System).
    
    WATEC 902H2 SUPREME (EA)video camera set on maximum
    sensitivity-at expense of S/N (signal to noise ratio),
    and locked on exposure 1/60th second. Recorded as NTSC
    (555 lines) at 29.97 frames/sec and used with ~ 100mm
    focal length f/2.8 lens, field of view approx 3.9 x 2.9
    degrees.
    
    Images processed and measured manually.
    
    Site 0433 : Longitude 18.51294 deg East, Latitude -33.94058 deg,
    Elevation 10 metres-situated in Pinelands (Cape Town),South Africa
    
    FOR CLASSFD.TLE:
    ------------------------------
    09415 76 091A   0433 F 20130128205032815 55 15 0948449-712420 19
    09415 76 091A   0433 F 20130128205057612 55 15 1038529-783118 19
    09415 76 091A   0433 F 20130128205140482 55 15 1506264-835552 19
    23851 96 024A   0433 F 20130128204227528 55 15 1616363-754128 19
    23851 96 024A   0433 F 20130128204318679 55 15 1458329-823439 19
    23851 96 024A   0433 F 20130128204430050 55 15 0704381-792237 19
    23851 96 024A   0433 F 20130128204538170 55 15 0551167-565533 19
    28888 05 042A   0433 F 20130128203453569 55 15 1434478-674003 19
    28888 05 042A   0433 F 20130128203616192 55 15 1207159-693917 19
    28888 05 042A   0433 F 20130128203715217 55 15 0958092-632300 19
    28888 05 042A   0433 F 20130128203836776 55 15 0807193-401749 19
    36105 09 066B   0433 F 20130128200344443 55 15 1345548-542700 19
    36105 09 066B   0433 F 20130128200419373 55 15 1310212-531210 19
    36105 09 066B   0433 F 20130128200433920 55 15 1250261-524548 19
    36105 09 066B   0433 F 20130128200451608 55 15 1227472-512347 19
    36105 09 066B   0433 F 20130128200504264 55 15 1210490-500423 19
    39025 12 071A   0433 F 20130128184029322 55 15 0345502+231959 19
    39025 12 071A   0433 F 20130128184042744 55 15 0417467+201319 19
    39025 12 071A   0433 F 20130128184123971 55 15 0614429+055815 19
    39025 12 071A   0433 F 20130128184212156 55 15 0818438-100600 19
    39025 12 071A   0433 F 20130128201505051 55 15 0010191-174656 19
    39025 12 071A   0433 F 20130128201523864 55 15 0009020-221635 19
    39025 12 071A   0433 F 20130128201608172 55 15 0001117-361323 19
    
    NORTH KOREAN OBJECTS:
    ------------------------
    39027 12 072B   0433 F 20130128203242868 55 15 0045217-475535 19  +062 05
    
    NOTES:
    ---------
    (1) This session marks the end of trying to observe satellites in
        real time using video with 1/60th second exposures required for
        observations of the North Korean satellite and rocket. As optical
        visibility is now basically over for these objects I no longer need
        to operate in this mode. Whilst the NK rocket is an easy object the
        satellite is not - basically being too faint for this setup except
        under very favourable conditions.
    
    (2) I will now move onto my next experiment. The components required
        should be delivered tomorrow-nothing fancy-just required so
        that my DSLR camera can be attached to my 6 inch reflector
        which I am hoping will give me a reasonably large field of view
        ( 3 to 4 degrees ) down to a respectable magnitude ( hopefully at
        least mag +14 or +15) and using my SP-C6 Celestron on its equatorial
        mount. Since the Celestron was made for the northern hemisphere
        the RA circle reads back to front so will have to be modified
        and the burning question at the moment is will the DSLR camera be
        able to reach focus at prime focus - it should since the Finger Lakes
        CCD camera can. The problem with using the CCD camera on the 6 inch
        is that it is rather too heavy for my CoSaTrak mount so in future
        I plan to use the CCD camera on the Skywatcher 4 inch f/5
        refractor on the CoSaTrak mount and the Nikon DSLR on the 6 inch
        f/5 reflector carried on its SP-C6 equatorial mount. Whilst the
        Nikon DSLR is not as sensitive as the CCD camera it has a larger
        format sensor so a larger field of view.
        Ian Roberts (no relation that I know of!) has shown that a DSLR
        camera ( must have removable lens and capable of time or "bulb"
        exposures) can be used for deep space satellites and meet the
        requirement that the APEX astrometric reduction software package
        can process such images.
    
    Cheers
    Greg
    
    
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