Mimas' far-UV albedo: Spatial variations
Abbreviated Journal Title
Satellites, Composition; Ices, UV spectroscopy; Saturn, Satellites; Ultraviolet observations; Satellites, Surfaces; HYDROGEN-PEROXIDE; WATER ICE; E-RING; SATURNIAN SATELLITES; ION; IRRADIATION; ENCELADUS; PHOTOMETRY; EUROPA; ORIGIN; PHOTOLYSIS; Astronomy & Astrophysics
We present Cassini Ultraviolet Imaging Spectrograph (UVIS) observations of Mimas at far-ultraviolet wavelengths (170-190 nm) which show an interesting albedo gradient across the anti-saturnian hemisphere. We discuss the photometric behavior of Mimas in the far-UV and review the important exogenic processes and their expected effects, relevant over a wide range of wavelengths. We suggest that the UVIS images display the brightening effects of E-ring grain accretion on Mimas' trailing hemisphere; we also show VIMS results that are consistent with E-ring grain accretion on the trailing hemisphere. The UVIS results also suggest the presence of hydrogen peroxide, predominantly in the southern hemisphere, produced by photolysis; this is expected to be a seasonal effect as a result of enhanced UV insolation during the recently-ended southern summer. (C) 2012 Elsevier Inc. All rights reserved.
"Mimas' far-UV albedo: Spatial variations" (2012). Faculty Bibliography 2010s. 2738.