Quote:
Originally Posted by glend
Can you post just the 1600 luminance? And what ADU value were you getting in the dark section of your subs? Thus will inform sub sky glow. What scooe was used?
|
Glen, the luminance is
here. It's nowhere near as heavily processed as the final colour image - it is still quite rough.
For the subs, the background (gain 139) was at the lowest (near the meridian) about 570 ADU over bias, so quite well shot noise limited (60 sec exposures). Noise on each frame was about 7electrons - so most of that from light pollution, with a smidge dark noise. At the faint ends of the galaxy, the signal in 60 seconds was about 2-3 electrons. Once stacked, noise was down to about 0.5 electrons, but those faint areas are then only 4-6x above the noise at best.
The scope was an RC8.
Quote:
Originally Posted by DJT
Nice one Paul. Just picked up one of these ASIs to play around with the RC so good to see what you have been able to do with that combination.
Did you do any star morphology with this?
|
Thanks David. No morphology. Just a tad deconvolution.
Quote:
Originally Posted by multiweb
That's pretty good. Great details and colors.
|
Thanks Marc.
Quote:
Originally Posted by Placidus
Very sharp and crisp. Some nice background galaxies too.
|
Thanks Mike and Trish.
Quote:
Originally Posted by strongmanmike
Not bad Paul, at only 7 Million light years and over 1/2 deg in apparent size (bigger than NGC 253) this is a great galaxy for getting some good detail out of and you have managed to do just that here.
The background is a bit blotchy but I like the delineation of the HII regions and all the dusty detail, overall a good galaxy image mate
Mike
|
Thanks Mike. If there's anything to fix that faint blotchiness, I'm all ears. I suspect though it's simply from the bit of noise reduction applied (and that wasn't much) and I just need longer total exposure time than the 3 hours used there??