Ultraviolet Imaging and Spectroscopy of the Icy Galilean Satellites

Details Ultraviolet Imaging and Spectroscopy of the Icy Galilean Satellites Ultraviolet Imaging and Spectroscopy of the Icy Galilean Satellites

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5837n&link_type=abstract

HST Proposal ID #5837

Mathematics

Logic

Hst Proposal Id #5837 Solar System

Scientific paper

We will obtain the first ultraviolet images of the three icy Galilean satellites, Europa, Ganymede, and Callisto, with the HST WFPC2. No other observatory or spacecraft has been or will be capable of obtaining resolved images of Jupiter's large satellites at wavelengths below 3200 Angstrom . Strong UV bands of SO2 and other spectral features caused by charged particle impacts in ice produce significant albedo effects in this part of the spectrum. Correlation of UV albedo maps to visible geologic features will allow us to investigate both internal and external processes that modify these surfaces. We will also obtain high S/N spectra of all three satellites from 1800-3300 Angstrom , including the first useable spectra ever below 2400 Angstrom . The FOS spectra are of sufficiently high resolution that we will be able to distinguish between different compositional and physical states of the surfaces. The spectra will also improve the interpretation of the images. Our program of imaging and spectroscopy will be coordinated with a series of `final' IUE and groundbased near-UV observations to be executed prior to the Galileo encounter with the Jovian system. The measurements will provide the temporal tie between 15-plus years of IUE spectroscopy and the HST/Galileo epoch and, more importantly, will shape the priorities for the Galileo satellite encounters on that now bandwidth-limited mission.

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