The double transit
Posted 17 October 2013 - 07:58 PM
Talk about dumb luck, I decided to take a look at Jupiter this morning more on a whim than a plan. I don't normally observe in the wee morning hours on a worknight (morning) but for some reason did today. While still wiping the sleep from my eyes I noticed a big black dot near the edge of the planet. That got my attention. Then as I was finding the optimal magnification I noticed the smaller black dot close to the center of the disk. Wow! It wasn't until I came inside later than I found out it was Ganymede and Io.
It was rather foggy which has the benefit of acting like a filter so Jupiter was never too bright. Unfortunately the fog continued to get thicker and soon I was losing detail. Still, it was fantastic!
Hope others got to see it.
Posted 18 October 2013 - 10:48 AM
Posted 19 October 2013 - 04:57 PM
The shadows at one point were right by or right on the Great Red Spot!
Posted 19 October 2013 - 08:46 PM
Posted 20 October 2013 - 12:48 PM
The transiting moons causing the shadows were Io and Europa; Ganymede was a bit too far away to cast any shadows on Jupiter's disk.
FYI, there were two double transits. One on the 17th with Ganymede and Io and one on the 19th with Io and Europa.
Posted 21 October 2013 - 10:52 AM
But last night there was another "double" (or really, "triple") event, and again, I saw it "accidentally", i.e., I didn't know about it beforehand: I saw Ganymede close up to the limb, then attach, and disappear. Then without knowing it either, I was still observing Jupiter when Europa began to bud out from the opposite limb and break off! Pretty cool stuff! I missed Io coming out from the same side where Ganymede went into, but still, pretty good.
Posted 21 October 2013 - 06:24 PM
Saturday morning was the day I was hoping to see the transit. I was free from work, and the sky was clear!
Unfortunately for me, the skies were just terrible. While they were clear, the seeing was just god-awful. It was the first time I've been able to see a huge difference in what my EPs can provide under bad conditions. My 14mm was around the cutoff of what the skies could handle -- anything stronger than that made for some very muddled views.
In any event, despite staying up until well into the dawn, I wasn't able to see anything of any detail on Jupiter. It was another big letdown!
Posted 21 October 2013 - 08:15 PM
Hang in there Starcrafter. We all know unpredictable the skies can be!