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On a suspected ring external to the visible rings of Saturn (1975)

Feibelman, W. A. ; Cook, A. F., II ; Beebe, B. F. ; [et al.]

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Publication Date: 2011-08-16

Description: Reexamination of a photograph of Saturn taken on Nov. 15, 1966, when the earth was nearly in the ring plane, indicates that ring material may exist outside the visible rings, extending to more than 6 Saturnian radii. Although the suspected feature on the photograph appears to be real, the possibility of its being a developed pressure mark or a chance alignment of grains cannot be ruled out. The observed brightness in the blue light was estimated to be 19.5 plus or minus 0.5 per linear arcsecond, implying a normal optical thickness, .0000001 for ice-covered particles. For spacecraft passing through this region, the hazards are found to be minimal.

Keywords: LUNAR AND PLANETARY EXPLORATION

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