Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jalpo..51a..32b&link_type=abstract
Journal of the Association of Lunar & Planetary Observers, The Strolling Astronomer (ISSN 0039-2502), Vol. 51, No. 1, p. 32 - 62
Astronomy and Astrophysics
Astrophysics
Saturn, Observations, Astrophotography
Scientific paper
For the 2005-2006 apparition (from August 23, 2005 through June 12, 2006) the ALPO Saturn Section received 414 visual observations and digital images submitted by 50 observers in the USA, Germany, Romania, Japan, France, Canada, Philippines, Italy, UK, Spain, and The Netherlands. Apertures used to perform observations ranged from 12.5cm up to 76.2cm. Saturn observers occasionally reported discrete, short-lived dark features in the South Equatorial Belt during the observing season, as well as small enduring white spots in the South Polar Region (SPR), the South Equatorial Belt Zone (SEBZ) and South Tropical Zone (STrZ). The SEBZ and STrZ white spots, first detected in November and December 2005, exhibited notable changes in morphology as the apparition progressed. A few recurring central meridian transit timings were submitted for some of these features. The inclination of Saturn's ring system towards Earth attained a maximum value of -20.21° on April 4, 2006, so observers could view and image considerable portions of Saturn's Southern Hemisphere and South face of the rings throughout the observing season. With the diminishing ring tilt, regions of the Northern Hemisphere, such as the North Polar Cap and North Polar Region were becoming accessible to our Earth-based telescope. A summary of visual observations and digital images of Saturn contributed during the apparition are discussed, including the results of continuing efforts to image the bicolored aspect and azimuthal brightness asymmetries of the rings. Accompanying the report are references, drawings, photographs, digital images, graphs, and tables.
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