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Well I'm no expert David but I'll tell you what I know.
I take it a 12”f/5 Dobsonian is enough to view these events?
Yes. I have a 10" F5 and can see it.
If so What eye piece or Mag do you recommend with such a telescope?
I magnify it as far as I can. But balance it with ease of tracking too. I usually barlow a 15mm at the most.
Should I use a planet filter, if so what color suits Jupiter?
Never tried. I have used my polarising filter which can help.
With the UTC I am just outside of Brisbane and usually just use +10:00 that my computer uses, but I was wondering how do you account to set the minutes more accurately? & if it’s worth doing.
Don't know & probably not.
Oh yea…what should I set the Display (Inversion setting) to if I am using a Newtonian or Refractor?
The default settings were right for me.
According to the program (from how I have it set-up)-Ganymede will just be transiting right on 11:38 tonight. What should I be looking for in terms of image/brightness/contrast/shape/size & color?
All you will see is a tiny black dot on Jupiter the size of the moon with space as its background.
Does a shadow always accompany such events?
No
Don't worry. It is not too hard to see. Just make sure you are collimated first and you'll be fine. Let me know how you go.
Regards
Shane
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