Photometric confirmation of the Encke division in Saturn's ring A

Details Photometric confirmation of the Encke division in Saturn's ring A Photometric confirmation of the Encke division in Saturn's ring A

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978natur.272..601r&link_type=abstract

Nature, vol. 272, Apr. 13, 1978, p. 601, 602.

Astronomy and Astrophysics

Astronomy

4

Astronomical Photometry, Computerized Simulation, Eclipses, Iapetus, Saturn Rings, Limb Darkening, Solar Limb, Three Body Problem, Saturn, Rings, Optical Properties, Photometry

Scientific paper

A physical model of the behavior of Saturn's satellite Iapetus passing through the shadow of the rings is discussed. The model is examined via computer simulation to give photometric confirmation of the Encke division in ring A. The actual event was observed with a two-channel sky-chopping photometer. Simultaneous pulse-counter output from the red and blue channels was integrated for 10-ms intervals alternately on the sky and on Iapetus. In the computer simulation a solar limb-darkening coefficient was used in the blue region and Iapetus was considered two limb-darkened hemispheres of radii 800 km with the trailing hemisphere brighter than the preceding hemisphere by a factor of seven.

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