Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icar...53..165o&link_type=abstract
(Saturn Conference, Tucson, AZ, May 11-15, 1982.) Icarus, vol. 53, Feb. 1983, p. 165-173.
Astronomy and Astrophysics
Astronomy
Gaps, Planetology, Saturn Rings, Astronomical Photography, Histories, Telescopes, Voyager Project, Saturn, Telescopic Observations, Rings, A Ring, Gaps, Divisions, History, Encke Division, Characteristics, Images
Scientific paper
On January 7, 1988, while observing Saturn with the Lick Observatory 36-in. refractor, Keeler discovered a narrow, dark division in the outer part of the A ring. This gap is not identical with the feature which Encke had discovered in 1837, and described as a low contrast division near the middle of the A ring. Subsequent observations by Lyot (1953) and Dollfus (1961) have shown that the Encke division is complex, appearing as three wide minima of light which are fuzzy and of low contrast, with a narrow and well marked minimum of light at its outer edge. The superior resolution of the images obtained from the Pioneer and Voyager space probes show that the Encke division is even more complex than Lyot and Dollfus realized, but also confirm the narrow Keeler feature as a true gap in the outer part of the A ring.
Cruikshank Dale P.
Osterbrock Donald E.
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