HR: 1340h
AN: P53B-1247    [Abstracts]
TI: CO2, SO, Hydrates, and Other Constituents on the Trailing and Anti-Jovian Hemispheres of Europa From Reprocessed Galileo/NIMS Measurements
AU: * Hansen, G B
EM: ghansen@rad.ess.washington.edu
AF: University of Washington, Dept of Earth and Space Science Box 351310, Seattle, WA 98195-1310, United States
AU: McCord, T B
EM: Mccordtb@aol.com
AF: Bear Fight Center, P.O. Box 667, Winthrop, WA 98862, United States
AB: The Near Infrared Mapping Spectrometer observations at wavelengths 0.7-5.3 μm of the Jovian moon Europa are being repro­cessed using information gained throughout and beyond the Galileo mission. Early analysis of these reprocessed data (a global observation of the anti-Jovian and trailing hemispheres at 47 km spatial resolution) show evidence of spectral features not or only weakly apparent before (e.g., Geophys. Res. Lett., submitted). These include strong absorption bands attributed to CO₂ and SO (centered near 4.25 and 4.0 μm, respectively), as well as weaker bands, such as one attributed to H₂O₂ (near 3.5 μm). The strong hydrate bands, including at near 1.5 and 1.95 μm, are more clearly defined. The band depth distribution of the CO₂ and the most well defined hydrate bands are strongly associated with the (endogenic) dark reddish regions on the surface. The SO is not strongly correlated with the CO₂, but has a similar sparse distribution. We will continue this study looking at higher spatial resolution observations and higher spectral resolution observations of the same area from the same and other orbits of Galileo.
DE: 5215 Origin of life
DE: 5410 Composition (1060, 3672)
DE: 5464 Remote sensing
DE: 6221 Europa
SC: Planetary Sciences [P]
MN: 2007 Fall Meeting