Galileo Ultraviolet Spectrometer Observations of Europa

Details Galileo Ultraviolet Spectrometer Observations of Europa Galileo Ultraviolet Spectrometer Observations of Europa

Sep 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996dps....28.2136h&link_type=abstract

American Astronomical Society, DPS meeting #28, #21.36; Bulletin of the American Astronomical Society, Vol. 28, p.1140

Astronomy and Astrophysics

Astronomy

2

Scientific paper

The Galileo Ultraviolet Spectrometer (UVS) observed Jupiter's moon Europa on June 23, 1996 for 15 minutes before Europa entered eclipse and for 20 minutes after Europa emerged from eclipse. The phase angle during the observations was 44--49deg , and Europa's leading hemisphere (45deg longitude) was observed. We use the Hapke function, which relates the measured bidirectional reflectance to the single-scatter albedo (w) of the particles, the opposition effect due to shadow-hiding and coherent backscatter, multiple scatttering, and surface roughness, to determine the single-scatter albedo that best fits the Europa pre- ingress and post-egress data. We find that Europa's surface does not increase in brightness after being in Jupiter's shadow. We find no sign of SO_2 on Europa's leading hemisphere. The single-scatter albedo of Europa's leading hemisphere increases from 0.2 at {2200 Angstroms} to 0.6 at {3200 Angstroms}.

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