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Title:		Visual detection of 1981S13, Saturn's eighteenth satellite, and its role in the Encke gap
Authors:		SHOWALTER, MARK R.
Affiliation:		AA(Stanford University, CA)
Journal:		Nature (ISSN 0028-0836), vol. 351, June 27, 1991, p. 709-713. NASA-supported research.
Publication Date:		06/1991
Category:		Lunar and Planetary Exploration
Origin:		STI
NASA/STI Keywords		GRAVITATIONAL EFFECTS, SATELLITE IMAGERY, SATURN RINGS, SATURN SATELLITES, VISUAL OBSERVATION, ASTRONOMICAL PHOTOMETRY, ORBIT CALCULATION, VOYAGER 1 SPACECRAFT, VOYAGER 2 SPACECRAFT, WAKES
Bibliographic Code:		1991Natur.351..709S

Abstract

Careful inspection of many images taken by the Voyager spacecraft reveals the presence within the Encke gap of Saturn's eighteenth satellite. Its existence had been inferred from gravitational disturbances seen in Voyager data, and it falls close to the predicted orbit, its shepherding effect is responsible for keeping the Encke gap open, and it may also be the progenitor of a narrow ringlet within the gap.

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