The latest image of Tethys, one of Saturn’s Moons, looks different in comparing with the known images of the moon.
Streetcap1: “On images of Tethys in Google Search, I have yet to find this other Crater. The lower crater is visible but not this upper one. Maybe a case of misidentification by NASA and it's another moon entirely.”
As Streetcap1 says, maybe a case of misidentification, could be, but seems unlikely. Anyway they probably had a good reason to cover the original moon Tethys.
Video: A closer look at the unknown planet or Moon.
Original Image link: http://photojournal.jpl.nasa.gov/jpegMod/PIA18318_modest.jpg
Thanks to: http://ufosightingshotspot.blogspot.com/