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Hi mate.
I live in Bortle 2-3 skies in Wauchope NSW.
Last week I was observing Jupiter through our 10” dob and there was no problem seeing Jupiter’s moons as they’re quite bright.
When I added the Barlow lens to my 9mm plossl I noticed quite clearly the shadow of one of its moons on the surface. The moons/shadows transition across very quickly under observation.
You may find the more limiting factor to be the atmospheric seeing conditions that will limit the magnification you can use, which can change through the evening too.
At least you’re armed with the info of it happening? I only found it by chance.
Where did you get the info for Monday?
Regards, Tim.
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