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Saturn 24th June- Great seeing

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#1 wargrafix

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Posted 26 June 2019 - 11:26 AM

Hey everyone. I had a spell of great seeing and after a good Jupiter session, I turned my attention to Saturn. My tracking was good. so  i decided to experiment.

 

I shot with the C 9.25 @ f27

3X barlow and ZWO ADC

ASI 224MC

 

Stacked in Autostakkert, derotated in Winjupos

 

 

First image I shot with my traditional 100FPS high gain. 20 minutes derotated.

 

gallery_218407_320_35913.jpg

 

After I tried with 28 fps with a much lower gain.

 

gallery_218407_320_28314.jpg

 

What do you all think?


Edited by wargrafix, 26 June 2019 - 11:31 AM.

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#2 Dynan

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Posted 26 June 2019 - 11:33 AM

Great Shot! You can even see the hexagonal pole formation!


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#3 clusterbuster

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Posted 26 June 2019 - 11:47 AM

Very Nice !

 Mark


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#4 descott12

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Posted 26 June 2019 - 12:50 PM

Beautiful shots

Question - why derotate? I understand using winjupos on Jupiter but Saturn doesn't really have any longitudinal variation to derotate.  Or am I missing something?


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#5 aeroman4907

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Posted 26 June 2019 - 12:52 PM

Beautiful shots

Question - why derotate? I understand using winjupos on Jupiter but Saturn doesn't really have any longitudinal variation to derotate.  Or am I missing something?

Likely for keeping clarity of the polar hex and any micro-storms that may be present.  Also to reduce noise by incorporating the results of more frames.


Edited by aeroman4907, 26 June 2019 - 12:59 PM.

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#6 descott12

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Posted 26 June 2019 - 01:05 PM

Likely for keeping clarity of the polar hex and any micro-storms that may be present.  Also to reduce noise by incorporating the results of more frames.

Ah yes. I forgot about the polar hex



#7 wargrafix

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Posted 26 June 2019 - 01:06 PM

which one looks better though?



#8 aeroman4907

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Posted 26 June 2019 - 01:17 PM

which one looks better though?

The derotated image has less noise that I can see, so that would be my vote for the better image.

 

Nice captures by the way - very resolute!



#9 wargrafix

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Posted 26 June 2019 - 01:57 PM

Oh, they are both derotated. One was 100fps high gain, the other was 28fps lower gain



#10 aeroman4907

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Posted 26 June 2019 - 02:07 PM

Oh, they are both derotated. One was 100fps high gain, the other was 28fps lower gain

Sorry, I didn't understand that.  My answer still goes to the first with higher gain.  That begs a question though - how many frames did you use in each image?  I would imagine that you must have significantly more frames in the higher gain image that is apparently enough to produce less noise than the low gain capture.



#11 wargrafix

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Posted 26 June 2019 - 02:11 PM

I don't have hard numbers right now. I can get those for you.

 

What I know is both were 20 mins. of capture time. The 28fps would have yielded less frames. The 100fps would be about 130k. So about 70% of that. Same with the 28fps.



#12 mic1970

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Posted 26 June 2019 - 02:17 PM

Love it.  How many frames was in the final stack.

 

Hey everyone. I had a spell of great seeing and after a good Jupiter session, I turned my attention to Saturn. My tracking was good. so  i decided to experiment.

 

I shot with the C 9.25 @ f27

3X barlow and ZWO ADC

ASI 224MC

 

Stacked in Autostakkert, derotated in Winjupos

 

 

First image I shot with my traditional 100FPS high gain. 20 minutes derotated.

 

gallery_218407_320_35913.jpg

 

After I tried with 28 fps with a much lower gain.

 

gallery_218407_320_28314.jpg

 

What do you all th



#13 wargrafix

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Posted 26 June 2019 - 02:28 PM

the 100fps one? About 100K in the stack



#14 aeroman4907

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Posted 26 June 2019 - 02:30 PM

Since you are asking for some level of critique, I would add that the magenta hues are a bit too strong, plus I observed both magenta and cyan hues in the rings, which should be pretty close to colorless.



#15 Billytk

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Posted 26 June 2019 - 04:16 PM

I like the lower frame one. I can see the polar hex better.



#16 wargrafix

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Posted 26 June 2019 - 04:36 PM

Agreed. However, the seeing requirements for the lower fps makes it a real challenge

#17 KiwiRay

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Posted 26 June 2019 - 06:44 PM

I like the upper one - less noisy, and provides some evidence that I'm also doing the right thing in using high gain to increase frame rates for Saturn.

 

The planet itself looks nicely detailed in your images, but the rings seem overprocessed.  Have you tried processing the rings separately?  They tend to need less sharpening and far less colour saturation than the planet.  Sharpening both to the same degree leads to the too-wide Cassini division seen in your images, and less sharpening will reduce some of those artifacts in the rings.

 

Anyway, congratulations on capturing such high-quality data.  The details in your C9.25 images are comparable to some recent images from larger scopes.



#18 wargrafix

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Posted 26 June 2019 - 07:34 PM

I have to run the denoise function. That should deal with the rings.

The spacing is ok. I ran one by mr. Peach


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