Europa's phase curve - Implications for surface structure

Details Europa's phase curve - Implications for surface structure Europa's phase curve - Implications for surface structure

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991icar...90...30d&link_type=abstract

Icarus (ISSN 0019-1035), vol. 90, March 1991, p. 30-42. Research supported by NASA and NSF.

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Astronomical Photometry, Europa, Satellite Surfaces, Surface Roughness, Albedo, Porous Materials, Solar Cycles, Voyager 2 Spacecraft, Jupiter, Satellites, Europa, Phase Curve, Surface, Structure, Albedo, Earth-Based Observations, Photoelectric Methods, Photometry, Amplitude, Optical Properties, Roughness, Regolith, Scattering, Absorption, Spacecraft Observations, Voyager Missions, Analysis, Data, Texture, Ions, Bombardment, Grain Size, Implantation

Scientific paper

The surface of the Jovian satellite Europa is characterized on the basis of an analysis of ground photoelectric photometry at 470 and 550 nm and Voyager images. The data are presented in extensive tables and graphs and discussed in detail. At 550 nm, Europa has single-scattering albedo 0.964, opposition-effect amplitude 0.5, opposition-effect width 0.0016, double-lobed Henyey-Greenstein factors b = -0.429 and c = 0.113, and mean roughness angle 10 deg (much lower than on other solar-system objects). From the small roughness and the 96-percent porosity implied by the narrow opposition peak, it is concluded that the surface was formed mainly by endogenic processes. It is also noted that only one of three observational criteria for preferential ion bombardment of the trailing hemisphere are met in Europa.

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