The action of the satellite 1981 S13, and the optical depth profile of the Encke-gap ringlet in the Saturn A ring

Details The action of the satellite 1981 S13, and the optical depth profile of the Encke-gap ringlet in the Saturn A ring The action of the satellite 1981 S13, and the optical depth profile of the Encke-gap ringlet in the Saturn A ring

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992an....313..101s&link_type=abstract

Astronomische Nachrichten (ISSN 0004-6337), vol. 313, no. 2, 1992, p. 101-105.

Astronomy and Astrophysics

Astronomy

Eccentric Orbits, Natural Satellites, Optical Thickness, Orbit Calculation, Saturn Rings, Planetary Mass, Ultraviolet Spectrometers, Voyager Project

Scientific paper

The radial optical depth profile of the Encke ringlet obtained by the occultation experiment of the Voyager photopolarimeter is shown to be caused by the gravitational action of the recently discovered satellite 1981 S13 and a second smaller moonlet orbiting near one of its libration points. The results of numerical particle simulations as well as an extension of the scattering theory concerning a single moonlet to a pair of satellite are used leading to a triple-peaked ringlet near the orbits of the moonlets. The width and the shape of that ringlet and its separate peaks depend on the mass ratio of both moonlets and on their orbital eccentricities. The best resemblance between the PPS data and the theoretical profile is obtained if the mass ratio of the moonlets is M2/M1981S13 approximately equal to (0.8...3.0) x 10 exp -2, and certain eccentricities.

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