Re: Optical 28 Jan 2013

From: Scott Tilley (sthed475@telus.net)
Date: Wed Jan 30 2013 - 03:44:40 UTC

  • Next message: Greg Roberts: "Re: Optical 28 Jan 2013"

    Hi Greg
    
    I'm keenly monitoring your experiments with your DSLR.  I just purchased 
    a Canon T3i for my station here and got a couple of decent lenses with it.
    
    Cees and I are actively investigating how to automate GEO belt scans and 
    I hope to begin producing data soon.  To reach this objective please 
    expect MANY questions about observing way up high, particularly about 
    the integrated elsets and other tricks of the trade.  I should be able 
    to provide coverage of GEO's way out over the Pacific on a semi regular 
    basis that may have been under reported in the past.
    
    Looking forward to any tidbits of advice you may have and most of all 
    the first clear night !
    
    Regards,
    Scott
    
    
    On 1/29/2013 1:43 AM, Greg Roberts wrote:
    > 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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    >
    
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