Ok, I slipped yesterday and I'll double up today.
Day 10 of back log.  I think this was previously shared in partial, half-processed.  Here's the finished Jupiter with Io in transit, covering it's own shadow which only happens right near opposition.  The stat of elongation in the bottom of the image helps understand how close to opposition   At the precise moment of opposition the elongation is exactly 180.  Before and after are in the 170's.  This shot was taken only a day or so off from that exact moment and a rarity to get good seeing where the moon and shadow line up so nice!
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