Very nice angle! Interesting that this was shot from below the rings looking up, if I understand the photo caption correctly. If so, then that shows that the moons are not exactly in the plane of the rings but instead have an orbital inclination that brings them above the ring plane in an interesting way.
But Wikipedia tells me that Enceladus has an orbital inclination of just 0.019° relative to Saturn’s equator. So something is wrong in my understanding of this photo… Maybe the picture is upside down (intentionally)
Originally shared by SETI Institute
Like a cosmic bull’s-eye, Enceladus and Tethys line up almost perfectly for Cassini’s cameras.
Since the two moons are not only aligned, but also at relatively similar distances from Cassini, the apparent sizes in this image are a good approximation of the relative sizes of Enceladus (313 miles or 504 kilometers across) and Tethys (660 miles or 1,062 kilometers across).
This view looks toward the unilluminated side of the rings from 0.34 degrees below the ring plane. The image was taken in red light with the Cassini spacecraft narrow-angle camera on Sept. 24, 2015.
Image credit: NASA/JPL-Caltech/Space Science Institute
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