From: Alan Friedman <alan@greatarrow.com>

Date: October 10, 2011 11:07:35 AM MDT

To: Astro_IIDC@yahoogroups.com

Subject: Re: [Astro_IIDC] Ganymede transit!

Hi Jim,

That's a very nice result! I think you will achieve better resolution in your Jupiter images at 30. Ganymede, though, can benefit from the additional enlargement when the seeing is good. I considered getting up for the transit, but catching Jupiter in the west doesn't work very well from my backyard. Glad you got to see it. 

Alan

On Oct 10, 2011, at 11:05 AM, matt carmine wrote:

Seeing was not as good as it had been earlier this weekend but the Ganymede transit made it worthwhile to drag myself up and outside at 1:50 in the morning. The transit was just underway the shadow was just a small bite on the perimeter of Jupiter so I went back inside to brew some fresh coffee.

http://dl.dropbox.com/u/4852049/Jupiter%26GanymedeOct10.jpg

The f/45 exercise is probably futile given the seeing conditions around the Great Lakes but it did seem to show surface features of Ganymede more clearly!

Jim

PS Milton, those diagonal markings form your last email I assumed were just noise from maxing out the gains at f/45. Last night I cleaned all the accumulated dew crap from the mirrors and temps were a lot warmer so there was no dewing of the secondary to fight and much better light transmission.