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Ganymede and Io transiting Jupiter (19-20 October 2023), rdk_CA

Ganymede and Io transiting Jupiter (19-20 October 2023)

Acquisition type: Lucky imaging

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Description

I have gotten in the habit of checking the Sky and Telescope's JupiterMoons app each evening to check for any interesting transits. I was surprised to both Ganymede and Io passing in front of Jupiter later during the evening of 19 October. I was debating over whether I should try to image it -- I had taken down my C11 and mount since I was traveling for the annular eclipse the previous weekend, and was tired from a long week at work. However, similar to the annular eclipse last week, my wife told me that "I think you'll be happier if you go out and try to image it." Where would I be without such good advice?

This image was compiled from a series of 16 video captures obtained near midnight. I stacked the best 50% of 92000 frames in AutoStakkert 3, followed by sharpening in Reigstax and de-rotation in WinJuPos.

It was definitely cool to see the shadows of these two moons, especially distorted shadow of Ganymede projected on the southern pole of Jupiter sloping away from us! Io is a bit difficult to see at first, as it is hidden in the SEB band of Jupiter, but it is really clear you once you initially spot it. The dark poles of Io really illustrate why it is so challenging to image when it is not in front of Jupiter itself!

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Ganymede and Io transiting Jupiter (19-20 October 2023), rdk_CA
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