Monday, August 16, 2010

Dual Shadow Transits on Jupiter

Friday morning, August 13, 2010, the shadows of Ganymede and Io were falling on the disk of Jupiter during the morning twilight. From the calculations of Curt Renz, I knew that Io's shadow would appear at 5:09 AM Chicago time. I wanted to view this, and if I could, to get images. I have had a cheap Meade Lunar & Planetary CCD imaging system for awhile now, but have not used it much. I brought it for the Perseid peak to try to capture the dual shadow transits on Jupiter Friday morning. The results are not great, but over the course of nearly four hours I recorded the motions of the Galilean Satellites.


  1. Oh Jupiter moon transits are fun and magical!

  2. It had been a long time since I'd seen a transit, but I remember the very first time I saw one. It was completely unexpected; I had no idea my telescope could show the shadow. I literally jumped up and down with excitement.

    That summer I observed quite a few Jovian transits, and used timing them as practice for 2012's Venus transit.