Europa appears to be almost touching the disk of Jupiter, and its shadow is seen on the disk to the left. Io is dimly visible in the upper right corner of the image. As I took pictures of Jupiter on this evening, the movement of Europa away from Jupiter could be detected over a period of just a few minutes.

Jupiter's diameter is about 87,000 miles, more than 10 times that of Earth. Io's diameter is about 2200 miles, which is very close to that of our own Moon. Europa is slightly smaller, about 1900 miles in diameter.

Image details:  Stack of 360 exposures taken with a Canon T6i camera and a 14-inch Meade LX850 telescope.

June 18, 2016