Quote:
Originally Posted by Dennis
Hi Ken
Your image is a very good illustration of the differences in light gathering capabilities of differing Focal Ratio systems. With the Mewlon operating at F24, and a frame rate of 5fps, I did not pick up G and H, even though the DMK is more sensitive than your unmodified ToUcam.
Assuming your GSO 12” dobsonian has a Focal Ratio of say, F5, this makes it a more “sensitive” system as F5 is “faster” than F24, irrespective of the differences in aperture of the scopes. So, it is not the 12” of glass that works here, but the faster Focal Ratio, enabling you to easily capture the fainter components E, F, G & H.
Cheers
Dennis.
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Dennis, it isn't only a matter of f ratios and sensitivity with Trapezium. It is also a BIG matter of timing.
A & B are eclipsing binaries
'A' drops to mag 7.65 every 65 days
'B' drops to mag 8.65 every 6 days
G, H, and I are all variables. In the image above (the best I could get over many months) I was unable to image 'I' as it must have been at its weakest intensity.
I attempted for months to get all 9 stars, but as I saw 'I' appear, 'B' had slightly faded, and 'H' was completely gone and 'G' was very very faint.
It's a mathematical game that I gave up on after many months
One day I hope to get all 9, but I think it will be a timing fluke
