Other
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5452n&link_type=abstract
HST Proposal ID #5452
Other
Hst Proposal Id #5452 Solar System, Satelli
Scientific paper
The chemical identity of dark material in the solar system, both on planetary surfaces and in clouds is a longstanding question. Hypotheses have focussed on organic material produced either in situ, or transported from other bodies through impacts. The laboratory experiments of Khare, Sagan and others have identified a class of complex hydrocarbons that appear to have some of the characteristics appropriate to at least some of the dark matter observed in the solar system. We propose to further the study of organic matter in the solar system by recording the first UV spectra of Iapetus at wavelengths from 1800 to 2600 A, and vastly improve on the S/N of spectra from 2600 to 3300 A. Reflection spectra produced from optical constants of at least one candidate organic material, tholins show structure over this portion of the spectrum that may be identifiable in the dark hemisphere spectrum and help identify the chemical composition of this compared to the presumably ice-dominated bright hemisphere of Iapetus and a control spectrum of another icy Saturn satellite, Rhea.
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