>> Jupiter satellite events from project pluto
>> I = IO
> II = EUROPA
> III = GANYMEDE
> UTC-4 hours=EDT
>
> II : Tra start: 14 Aug 2020 11:36
> II : Sha start: 14 Aug 2020 13:03
> II : Tra end : 14 Aug 2020 14:23
> II : Sha end : 14 Aug 2020 15:52
> III: Tra start: 14 Aug 2020 23:30
>
> 22:30 EDT
> III: Sha start: 15 Aug 2020 2:30
> III: Tra end : 15 Aug 2020 2:51
> I : Tra start: 15 Aug 2020 3:23
> 00:08 EDT
> I : Sha start: 15 Aug 2020 4:08
> I : Tra end : 15 Aug 2020 5:40
> III: Sha end : 15 Aug 2020 5:54
> 01:54 EDT

This is an image of the shadow of the moon Ganymede (top left) and you can barely make out the moon itself leaving transit on the limb (right a little above middle).

I successfully used the two holer (hartman mask). I focused by eye first on Arcturus then used the mask and did see two distinct images, adjusted the focus until it was a good as possible, then removed the mask and slewed to Jupiter. I had tried using the mask on Jupiter but as a nonpoint source, it did not work at all.

Tracking was problematic and I had to manually guide the expos