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Jupiter and Ganymede 14 May

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#1 Lacaille

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Posted 16 May 2019 - 03:45 AM

Hi All,

 

Somewhat improved conditions on Tuesday night led to some pretty good seeing, though I have not yet seen anything as good for Jupiter as I had last Australian autumn. Saturn is still wallowing in the mire at 1 am and this session did not produce anything spectacular.

 

I continue to refine the CH4 images. I follow the protocol on Christophe Pellier's site, taking a long video (10 mins) with 2X binning and derotating it in WJ (having first extracted and sharpened a reference image based on 1000 frames from the video using PIPP, AS, and Registax).   The protocol is modified from when Christophe wrote it some years ago - he says there is no need to create a dark frame, and I must say there is no obvious effect if you do use one.  Compared with my early efforst in CH4, there is some quite nice detail here.  It is a difficult medium as you are collecting photons from just a few nm of bandwidth around 890 nm.  

 

Note that there are two cameras used here-  the 290MM for the IR and CH4 images, and the 224MC for the colour images.

 

I am about to have another go this evening, and will spend longer collimating and cooling. I am now using a Lymax cooler.

 

Thanks for looking

 

Mark

 

Jupiter 14 May 2019.png

 

 

 


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#2 Foc

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Posted 16 May 2019 - 04:01 AM

Good to see someone is doing well in Canberra with nice detailed images from a color cam. 

 

Dramatic and interesting images with the CH4  filter.


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#3 troyt

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Posted 16 May 2019 - 07:32 AM

Good images waytogo.gif


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#4 Vega700

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Posted 16 May 2019 - 08:28 AM

Nice images and great effort you put into them..


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#5 gfstallin

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Posted 16 May 2019 - 11:26 PM

I'm not sure whether it is seeing-related or somehow influenced by my color blindness, but to me the difference between the image with the ADC and the image without is pretty dramatic here. Great work. 

 

George 


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#6 Lacaille

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Posted 17 May 2019 - 03:20 AM

Hi George, thanks. The ADC was in position for Saturn, at around 30 deg alt, but I left it in place when returning for the final run on Jupiter, even though it was very high by that stage. Seeing was about the same to my eye, but I felt that, with the ADC in place, the f was raised well beyond the optimal. The image looked a bit bloated and pale. But the end result is more subtle, finer detail. (Sorry but I am away from my computer for a few days and cannot post the FC log files etc).
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#7 CPellier

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Posted 17 May 2019 - 04:16 AM

This is an excellent  CH4 image, detailed and contrasted :)


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#8 DMach

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Posted 17 May 2019 - 06:09 AM

Very nice CH4 image Mark, well done!


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