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Old 11-09-2009, 05:14 PM
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Quark (Trevor)
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Join Date: Apr 2008
Location: Broken Hill NSW Australia
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Jupiter Sept 10th, Ganymede + shadow, transit

Hi All,
Imaged Jupiter Sept 10th in fair to very average seeing. Started out at 6/10 and dropped off progressively over my, just over 3 hrs imaging session, to finish up at 5/10.

The rate that the temperature dropped off made my Peltier cooler invaluable for this session. With out it I doubt I would have captured any data worth processing.

The high pressure system that provided very good seeing 2 nights previously had moved on and I started to feel the effects of the front filling in behind it.

I have posted 4 RGB's from this session taken at 20 degree longitude CMII intervals. I was going to continue through to 220 degrees long to again record the Wesley Impact remnant but it would not have been visible in this level of seeing so finished with long 180 degrees.

The first image in this set is quite reasonable, in my opinion, but the seeing dropped of pretty steadily after it.

In the first image Ganymede is in transit.
In the second and third images Ganymede and its shadow are in transit.
In the fourth image some detail is visible on Ganymede probably albedo shading.

Thanks to Mike for explaining to me how to align the three channels for the moon and shadow.

Looking forward to the next high pressure system.

Thanks for looking.
Regards
Trevor
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