I had low expectations for observing last night. Transparency was compromised with marine mist and seeing was middling. I used Big Blue with my just installed ST80 finder and a cleaned-up observatory.
Jupiter was first up, using 277x, just to align the ST80. But I saw there was a shadow transit in progress, about 80% across, and a bright spot on the opposite side's limb on the NEB which was another moon just starting its ingress. Looking it up in my ephemeris I found it was Europa's shadow and Io just staring it's journey across. I watched until I could not see Io anymore, lost in the planet's light, and until Europa's shadow tangented the limb, looking like a poorly done hole-punch. The view at this point was soft, but fun to see the dark spot slip into the dark.
Scanned the moon's terminator for a while (binoviewers at low power), then it was too quickly time for bed.