Title

Mimas' far-UV albedo: Spatial variations

Authors

Authors

A. R. Hendrix; T. A. Cassidy; B. J. Buratti; C. Paranicas; C. J. Hansen; B. Teolis; E. Roussos; E. T. Bradley; P. Kollmann;R. E. Johnson

Comments

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Abbreviated Journal Title

Icarus

Keywords

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

Abstract

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.

Journal Title

Icarus

Volume

220

Issue/Number

2

Publication Date

1-1-2012

Document Type

Article

Language

English

First Page

922

Last Page

931

WOS Identifier

WOS:000308057200046

ISSN

0019-1035

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