Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982icar...49..194d&link_type=abstract
Icarus, vol. 49, Feb. 1982, p. 194-204.
Astronomy and Astrophysics
Astronomy
8
Astronomical Photometry, Saturn Rings, Astronomical Photography, Brightness Distribution, Coronagraphs, Light Scattering, Luminance, Particle Size Distribution, Radial Distribution, Reflectance, Satellite Perturbation, Ubv Spectra, Saturn, Observations, Photometry, Rings, E Ring, Procedure, Brightness, Phases, Scattering, Particles, Reflectivity, Gradients, Comparisons, Condensation, Structure, Symmetry, Equipment, Data, Photographs, Analysis, Reflectance, Lineaments
Scientific paper
A faint outer ring (E ring), which lies outside the classical rings A, B, C, and F, has been detected out to eight Saturn radii, confirming the 1966 observation by Feibelman. The plates were taken with a coronographic design and directly scaled in reflectance by reference to the properly attenuated Saturnian disk. Photometry of the edge-on ring E lineament shows a strong brightness increase at small phase angles, which is compatible with scattering by particles of several microns in radius. The excess reflectivity in blue compared to the B ring implies a significant contribution of small particles in the scattering process. The E ring shows brightness and radial gradient changes with condensations which differ between east and west limbs and are not always the same from night to night. The E ring is probably a flat structure with a condensation centered at a distance of four Saturn radii, but without a simple axial symmetry.
Brunier Serge
Dollfus Audouin
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