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Saturn 06/20/23: (tough) Double shadow & Dione transit

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#1 leoyasu

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Posted 23 June 2025 - 05:59 PM

I'm back! The next night, after my first capture of the year, I headed out again encouraged by the low JS forecast. Seeing wasn't as smooth as the night before, but we tried anyway.

 

Since seeing was very erratic (not bad, but inconsistent), I had to try various combinations of raw videos and reference times. In total, I had 40 videos, with a total of 1 hour of capture time. After selecting the best, I was left with only 27 videos to integrate into two derotated images. All videos had around 12,500 frames, of which I stacked 10%. Drizzle was not an option. Despite all this and the fact that I spent a few days carefully processing everything I ended up getting these two images:


2025-06-20-0928_6-LY-RGB-Sat.jpg

2025-06-20-1012_0-LY-RGB-Sat.jpg

 

In the first image, seeing was somewhat better. Enceladus can be seen above Saturn's rings, the transit of Dione and both moon shadows. I processed them separately to make them more visible but it was no easy task. This is part of a raw stack at 150%:
 

1.jpg

 

Later on, there was a double transit but I couldn't get Enceladus or its shadow out and Dione was tricky:

 

3.gif

 

Next time I'll check my scope collimation better and I'm keeping my fingers crossed for the 07/01 triple transit! Leo.

 


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#2 Winteria

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Posted 25 June 2025 - 02:28 AM

Shadows or not these are great images Leo. Very well processed and crispy.


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#3 R Botero

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Posted 25 June 2025 - 05:08 AM

These are fantastic Leo!  Thank you for sharing with us that can barely see Saturn up here at 52N.

 

Roberto


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#4 leoyasu

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Posted 25 June 2025 - 02:43 PM

Thanks guys! I had to bring my A-game to process those images that involved several derotations and different sharpening settings. Roberto, we only have Saturn here at 34° S. I'm getting old waiting for Jupiter again.


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#5 KMH

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Posted 25 June 2025 - 04:05 PM

Those are terrific!

 

Kevin


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#6 Kiwi Paul

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Posted 26 June 2025 - 03:09 PM

Outstanding work Leo.
Cheers Paul




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