Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.271..528f&link_type=abstract
Nature, vol. 271, Feb. 9, 1978, p. 528, 529. Research supported by the Consejo Nacional de Investigaciones Cientificas y Tecnica
Astronomy and Astrophysics
Astronomy
2
Luminous Intensity, Particle Size Distribution, Planetary Radiation, Saturn Rings, Astronomical Photometry, Azimuth, Brightness, Saturn, Rings, Albedo, Particles
Scientific paper
Observations of the brightness of ring A of Saturn indicate that it is not constant in azimuth. The A ring is fainter in quadrants following conjunction of the particles with Earth-Saturn line, and brighter in quadrants preceding conjunction. No azimuthal brightness variation of this type is found for the B-ring. A possible explanation for these phenomena has been given by Colombo et al. (1976). A description is presented of an alternative explanation, which would be valid if the particles in ring A are large. By using a recent measurement of the total mass of the rings reported by McLaughlin and Talbot (1977), it is shown that this is indeed the case. The presence of large particles in the rings would explain also the shift in position of the outer boundary of ring B, found by Franklin et al. (1971).
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