Io's shadow transiting Jupiter 9-4-2021 MDT (Steve Lantz)

Contains: Solar system body or event

Io's shadow transiting Jupiter 9-4-2021 MDT

Acquisition type: Lucky imaging

Since clear skies continued here in Denver, I went out for another crack at Jupiter. The seeing was poor, darn it, but I forged on anyway because Io's shadow was visible crossing Jupiter's disk. I used the 3X focal extender again on the 10 inch Newtonian and it did help considerably in capturing more detail than the 2X Barlow. After some battles with WinJUPOS I was able to get a stacked and de-rotated final image. This image was a combination of what started as 40 fifteen-second videos at about 80 fps, giving a total of 48,000 frames. Using 15 % of the frames (7200) for lucky capture, I first stacked them in groups of three or four to obtain 12 short interval stacked sub-images which did not individually need de-rotation. I then de-rotated the sub-images in WinJUPOS and stacked these frames to get a final image.

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Description: Since I had a a number of stacked frames, one stack from each of close to 40 videos, I decided to do an animation of the shadow of Io moving across the Jovian disk while Jupiter itself rotated. The image quality wasn't quite good enough to show where Io itself was clearly, so I did a little graphic embellishment to indicate where the moon was that was casting the shadow. It is interesting to note that Io's shadow overtakes features in the Jovian atmosphere due to the viewing alignment and speed of rotation (Jupiter) vs speed of revolution (Io).

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