While prepping for the partial solar eclipse (March 20) I filmed another jovial eclipse. I used winjupos* to look for a moon-moon eclipse and foudn that Ganymede is going to cast a shadow onto Europa on ~ 2015-03-09 23:39 UTC. So I set up my equipment to observe and record. Sadly the seeing was below avarage, so not many disk details could be mined out of the images with stacking – the stacked picture looks like a raw from this session -, but the moons danced almost as expected. I found that winjupos is one or two minutes off, but nevermind. Then I used Registax6 to stack the individual videos (22 videos, about 25 GiB) into individual frames. I touched up the pics with IrfanView’s batch processing* (rotation, a bit saturation) then I used PIPP* to center Jupiter, frame the scene and create the gifs. A bit of GIMP* was also used.

Animated, looped. North is upward, East is to the left

Animated, looped. North is upward, East is to the left

The sum of the frames. The gap in Europa's trail is the eclipsed moon

The sum of the frames. The gap in Europa’s trail (left) is the eclipsed moon

20150309_10_jupiter_europa_ganymede_eclipse_tablo_nyers

Vertically shifted sum of all frames. Background noise accumulates and original framing and rotation during post-processing also become obvious

Time in space

Time in space

Before the eclipse

Before the eclipse

Europa fading away, before maximum. During the maximum the moon faded from my view.

Europa fading away, before maximum. During the maximum the moon faded from my view.

Well after the eclipse

Well after the eclipse

*Thanks for coding :)

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