Jupiter's moons are "measured" interacting with one another.
The data points were taken at 5 second intervals. This is about the limit for the Cookbook camera to integrate and store an image.
The December 24 event had high thin clouds.
The eclipsed Ganymede is so close to Europa that the measurements made included both moons.
This reduced the actual drop in the measured brightness of Ganymede.
Io was too close to Jupiter to allow using it as a comparison "star".
A ring around the moon disclosed high thin clouds in the sky.
Io is the brighter object in the May images
The May sky was clear with a well developed moon high in the sky.
The data were obtained using a Cookbook 245 CCD camera on an 8" newt
Data were processed with AIP4win.
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