From ALPO conference 2006. A review of five major bright outbursts on Saturn and a suggested 57-year period

Details From ALPO conference 2006. A review of five major bright outbursts on Saturn and a suggested 57-year period From ALPO conference 2006. A review of five major bright outbursts on Saturn and a suggested 57-year period

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jalpo..48c..51h&link_type=abstract

Journal of the Association of Lunar & Planetary Observers, The Strolling Astronomer (ISSN 0039-2502), Vol. 48, No. 3, p. 51 - 57

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Saturn: Observations, Outbursts

Scientific paper

Most of the time, the observer of Saturn finds little detail beyond the major belts and zones. However, there were very conspicuous temporary brilliant features in the Equatorial Zone in 1876, 1933, and 1990. There were also unusually conspicuous bright features in North Temperate Latitudes in 1903 and in North Polar Latitudes in 1960. The five events are briefly described. It may be noted that the second recorded EZ "spot" followed the first one by 57 years and that the third one likewise fell 57 years after the second one. It is also curious that other unusual bright feature activity in the North Hemisphere occurred with a 57-year interval, namely, 1903 to 1960. There is discussion of whether similar major events may have occurred when Saturn was near its conjunction with the Sun, and hence have gone unrecorded. Other topics considered are the lack of evidence for the presumed sudden appearance of the EZ spots, some evidence for an acceleration in the rotation of the 1933 and 1990 Great White Spots about 25 days after they were discovered, and substantially better evidence for a northward latitude shift of several North Hemisphere belts while the 1990 feature was in its expansion phase.

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