The moon will be full and close by, but tonight shortly after midnight Io?s shadow will start to transit. It is anticipated that the Great Red Spot (GRS) will also be starting to cross the face of Jupiter and the shadow should be on the eastern edge of the GRS in the opposite hemisphere.

By the time the GRS transits(reaches mid point) about 2:00 am, the shadow will be north of the western edge of the GRS with the moon Io itself about halfway through the GRS and in the same plane as the shadow. This will afford opportunities to compare the transit speeds of the moon and the planet features as well as offer some wonderful imaging and sketching opportunities.

Now, if we can just get the weather to co-operate.