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Fireworks Galaxy ASI6200 & C14 edge at F7.7

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#1 pyrasanth

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Posted Yesterday, 04:40 AM

The Fireworks Galaxy, NGC 6946, is an interesting target as it has spurned many super novae in the last century- more than average.

 

The Galaxy is a faint target from my location and is obscured in the dust of our Milky way Galaxy-so at least for me from my Bortle 9 skies it presents itself as always looking a bit muted.

 

The image below is 180 10 second subs in each LRGB channel using Baader 50x50 mm filters. 3x3 bin with a gain of 0 off set 50.

 

Let me know what you think of the image

 

Best wishes- Mark- Stay safe!

 

FIREWORKS_WEB.jpg


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#2 Paul Garais

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Posted Yesterday, 06:29 AM

You got a lot out of the very short integration time. Love the colorful stars.

The only thing left to say: Get more subs

#3 pyrasanth

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Posted Yesterday, 06:41 AM

You got a lot out of the very short integration time. Love the colorful stars.

The only thing left to say: Get more subs

I would like more subs- I'm waiting for the longer nights- with 10 second subs and the wait between dithering of 5 seconds and the filter change I get 170 subs per hour. The imaging window is only currently 5 hours but when autumn comes and we are back into many more hours I think that is when the images should be better but for now its multiple nights if I want more subs to integrate.


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#4 Paul Garais

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Posted Yesterday, 06:55 AM

I am also in "waiting mode". I am at 51.84° N. Currently at 3 hours astronomical darkness per night, but increasing quickly.

But that is some serious amount of subs you have to stack, if you image through a winter night. Bortle 9 is no fun, it seems.

#5 pyrasanth

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Posted Yesterday, 07:54 AM

I am also in "waiting mode". I am at 51.84° N. Currently at 3 hours astronomical darkness per night, but increasing quickly.

But that is some serious amount of subs you have to stack, if you image through a winter night. Bortle 9 is no fun, it seems.

I know the feeling- I'm at 52 North so not a lot of dark hours yet.

 

I built a very powerful computer to handle all that processing. It only takes an hour to process 600 subs so even if I went into the thousands its only 2-3 hours at most. 

 

Bortle 9 is no fun but we just have to make the best of what we have.


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#6 lambermo

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Posted Today, 07:32 AM

I think you have captured a lot of signal with only 2 hours of exposure time. It looks good !

 

When I compare it with my setup :

 

 

# compare-telescopes.py --s1 custom1 --c1 asi1600 --s2 c14 --c2 asi6200 --r2 0.77 --c2b 3
# file /home/hans/src/compare-telescopes/telescopes-and-cameras.json
# Telescope 1 f/11.69 l=2970mm D=254mm O=37% res=0.26"/p FOV=20'x15'= 0.23x eoi= 0.43x poi= 0.21x e= 0.11x pe= 0.05x ps= 0.03x os= 0.32x
# Telescope 2 f/7.70  l=2738mm D=356mm O=32% res=0.85"/p FOV=45'x30'= 4.30x eoi= 2.31x poi= 4.70x e= 8.76x pe=21.13x ps=32.05x os= 3.09x

Yours is 4.3x 'faster' for extended object irradiance and 3.09x faster for object signal. So I should compare it with 8.6 hours with my setup if I look at eoi, or 6 hours for os. Seems plausible.

 

What reducer do you use ?

What is the bin3 sub file size ?




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