My first opportunity to photograph a moon shadow on Jupiter occurred on Tuesday evening as Calisto moved out from the planet just after dusk. The ’seeing’ was pretty bad so I used the 9.25″ Celestron without the x2 barlow and used the IR filter again. This f/10 combination enabled me to keep the individual exposures fairly short with a 10 fps framerate (the IR filter doesn’t let a great deal of light through!).
The final image is a stack of about 1500 frames (from an original video of 2300 frames). The Great Red Spot is also visible just to the right of the shadow.
