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Dione and Regulus

Dione and Regulus
Dione and Regulus Cassini captured this view of Dione on May 27, 2007. There is also a bight spot spanning several pixels in the field of view. This isn't another moon -- it's Regulus, which, at an apparent magnitude of 1.35, is the 21st brightest star in the sky. This image was captured as part of an observation with the UVIS instrument of Dione occulting Regulus; scientists were searching for evidence of a tenuous atmosphere around Dione. NASA / JPL-Caltech / SSI