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Ganymede 30 Oct 2012 from Arizona in good seeing

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#1 DesertRat

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Posted 30 October 2012 - 07:28 PM

Seeing was as good as I've had for some time so I decided to give Ganymede her due. When I process the Jupiter images from this morning I'll find out how good the seeing really was. But Ganymede appeared to be a small planet a good fraction of the time. Even so I did not trust focussing on the moon so I focussed on Jupiter and simply slewed over to 'right field' and caught this.

I used AS!2 3X drizzle and then further resized up to 5X. A simple wavelet scheme was used with no deconvolution, its difficult to bring much more out this I believe.

Some of what is shown on the disk appears to be real. Cannot claim there may not be some seeing or drizzling artifacts mixed in there.

Captured with a Flea3 using FireCapture 2.1.

Comments or questions welcome. Thanks for looking!

Glenn

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#2 Kokatha man

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Posted 30 October 2012 - 11:29 PM

Excelent Glenn..! :waytogo:

I'm with you re trying the sharpest Jovian focus for Gallilean Moons targetting.....I can be very pedantic re focus but I don't think I'd be game to try focusing on Ganymede itself! :question: :shocked:

#3 ToxMan

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Posted 31 October 2012 - 02:01 AM

Great catch.

#4 Eddgie

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Posted 31 October 2012 - 08:57 AM

Very nice.

I saw Galilee and Osiris visually in the C14 when Osiris was a bit in from the limb, so I know that they are easily in reach of the C14, but the image looks a bit over-exposed, so maybe these features are being washed out some???

This is not intended to be critical at all, but usually CCD images do better than I can visually, and I saw these features with a little more resolution, so maybe some processing work would help them look a bit better defined???

Great image though. I am seeing people pay more attention to the Jovian moons, and since these are targets I like to observer visually (when conditions allow) and I like having them for reference to confirm visual sightings...

Thanks for posting.

#5 Mike Spooner

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Posted 31 October 2012 - 11:08 AM

Hi Glenn,

I was hoping you were imaging last night. I was out about 11:00 PM (south of Casa Grande) and the seeing was the best I've caught in over a year (my schedule interferes a lot of the time). Jupiter was loaded with detail but I'm not sure I could pick up detail on Ganymede with a 9.8" - I've never been able to determine if the darkening near the center is reality or just effects of central obstruction (~28%).
I'm looking forward to your Jupiter images. :)

Best,
--Mike Spooner

#6 lcd1080

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Posted 31 October 2012 - 01:29 PM

Glenn I'm wondering how the moon would turn out if you did apply deconvolution; your image clearly shows the same dark area shown in the lower half of the WinJupos simulation -- at least I think the similarity of contrast and shape is clear.

Pete

#7 DesertRat

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Posted 31 October 2012 - 06:06 PM

Thanks guys!

Mike said:

I was hoping you were imaging last night.



Mike I was imaging last night and did manage to catch a few things, including Ganymede approaching Jupiter. I will be posting that shortly. The Jovian moons will show a donut appearance when processed too aggresively with wavelets or deconvolution. Even without an obstruction this occurs. But the obstruction does work a little against you. But then again sufficient aperture helps. What really helps is if the seeing is excellent!

Glenn

#8 Eddgie

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Posted 01 November 2012 - 10:19 AM

Let me ask you this... When you do these images are they simply cropped out of the image of Jupiter?

I would be curius as to what would happen if you imaged just Ganymede?

I don't even know if that is possible.

I would really be interested to see how much detail a C14 could capture on Ganymede.

#9 DesertRat

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Posted 01 November 2012 - 09:42 PM

Eddgie - Ganymede was imaged by itself. It was pretty far afield at the time.

I'd be interested how much detail can be captured myself. Will attempt again if I get one of those rare 8 or 9/10 seeing nights. I used to get those when I lived in the swamplands but the desert is not quite as forgiving.

Glenn

#10 claytonbigwood

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Posted 02 November 2012 - 03:57 AM

Very very nice Glenn :waytogo::waytogo:


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