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- W4313443037 abstract "On January 31, 2011, the remote-sensing instruments onboard the Cassini spacecraft (UVIS (Ultraviolet Imaging Spectrograph; ISS (Imaging Science Subsystem); VIMS (Visual and Infrared Mapping Spectrometer) and CIRS (Composite Infrared Spectrometer)) observed Helene, Dione's leading Lagrangian moon. We report here on the photometric characteristics of Helene between 0.11 μm and 5.2 μm. We find that Helene's spectrum is dominated by the signature of water-ice and we retrieve a grain size of 3.4 μm in the ultraviolet. At all wavelengths, Helene shows signs of being a relatively fresh surface less affected by space weathering effects than other observed surfaces in the Saturn system. We present the first phase curve of Helene at 0.61 μm and place our ultraviolet and near-IR results in a wider spectral context toward a better understanding of Helene's surface evolution. Previous studies suggested that either a recent impact on Helene or an asymmetric flux of E-ring particles could explain the satellite high surface brightness (Hedman et al., 2020). Results from this study favor the impactor hypothesis to explain Helene's photometric behavior." @default.
- W4313443037 created "2023-01-06" @default.
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- W4313443037 date "2023-03-01" @default.
- W4313443037 modified "2023-10-18" @default.
- W4313443037 title "Helene's surface properties from a photometric multi-wavelength analysis" @default.
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- W4313443037 doi "https://doi.org/10.1016/j.icarus.2022.115376" @default.
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