Computer Science
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6762r&link_type=abstract
HST Proposal ID #6762
Computer Science
Hst Proposal Id #6762 Solar System
Scientific paper
The ultraviolet reflectance spectra of the icy satellites ofUranus are largely unknown. We propose to use the HubbleSpace Telescope Faint Object Spectrograph in order to obtainthe first high S/N UV spectra of Ariel, Titania, and Oberon.Because of our innovative targeting approach, we have alsobeen able to include Umbriel in our observational plans.These satellites sample almost the full range of UV albedosand UV/VIS colors exhibited by the large Uranian satellites.The spectral resolution and range will overlap with earth-based telescopic and spacecraft observations of these objectsallowing for comparisons of the UV data with existing visualand near-infrared spectra of these objects. These comparisonswill ultimately provide greater constraints on the relativelylow albedo spectrally neutral non-ice component on the Uraniansatellites. The existance of UV spectral features due tospecies such as O_3, H_2O_2 or carbon-rich macromolecules(e.g. polycyclic aromatic hydrocarbons) can provide evidencefor modification of the surfaces via plasma or meteoriticbombardment, alteration by high-energy ultraviolet radiation,or accretion of particles from nearby sources such asplanetary rings or dust bands.
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