Here's Jupiter and its ice moon Europa in transit on Dec 3, 2011 at 5:34 UT (12:34 AM EST). Europa is located at about the 2 o'clock position on Jupiter near the edge of the planet. The ice moon appears to have a light yellow color due to chemicals emerging in liquid form between cracks in its crust; the liquid quickly freezes in place upon reaching the surface. Jupiter's moon Callisto appears in the lower right section of the image far beyond the edge of the planet; Callisto presents with a somewhat dark orange color. I recorded the video files for this image using a C11 SCT, a 2.5x barlow lens, and color filters working together with a monochrome CCD camera that captured 60 image frames per second.
