Ganymede Casts a Long Shadow Across the Surface of Jupiter Image from NASAJuno, processed by Thomas Thomopoulos, plus another by JohnChumack, article by Nancy_A
Another citizen scientist/image processer, Brian Swift created the graphic below using JunoCam data, illustrating the approximate geometry of the visible area, projected onto a globe of Jupiter.Credits: Image data: NASA/JPL-Caltech/SwRI/MSSS, Image processing by Brian Swift © CC BY
At the time this image was taken, the Juno spacecraft was about 44,000 miles above Jupiter’s cloud tops, at a latitude of about 55 degrees south, and 15 times closer than Ganymede, which orbits about 666,000 miles away from Jupiter. If you were lucky enough – or unlucky, perhaps due to the conditions on Jupiter – to be observer at Jupiter’s cloud tops within the oval shadow, you would experience a total eclipse of the Sun. NASA says that total eclipses are more common on Jupiter than Earth for several reasons. Jupiter has four large moons that often pass between Jupiter and the Sun: in seven days, Ganymede transits once; Europa, twice; and Io, four times.
Jupiter’s moons and their shadows are even visible from even amateur telescopes on Earth. This image was taken by noted astrophotographer Jupiter on Sept. 24, 2013 with its moon Europa casting a pinhead black shadow on Jupiter’s clouds. Credit: John Chumack
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