Saturn's rings - Azimuthal variations, phase curves, and radial profiles in four colors

Details Saturn's rings - Azimuthal variations, phase curves, and radial profiles in four colors Saturn's rings - Azimuthal variations, phase curves, and radial profiles in four colors

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...46..187t&link_type=abstract

Icarus, vol. 46, May 1981, p. 187-200.

Astronomy and Astrophysics

Astronomy

25

Astronomical Photography, Astronomical Photometry, Brightness, Saturn Rings, Azimuth, Color Photography, Distance, Phase Diagrams, Phase Shift, Saturn, Rings, Azimuth, Colors, Photometry, Analysis, Brightness, Data, Wavelengths, Phase Angle, A Ring, B Ring, Intensity, Orbits, Particles, Distance, Models, Data Reduction, Parameters, Albedo, Optical Properties, Thickness, Scattering

Scientific paper

Four-color photographic photometry, at effective wavelengths of 5900, 5350, 4150, and 3560 A, obtained during the 1977, 1978, and 1979 Saturn apparitions, were analyzed to determine the ring brightness as a function of wavelength, solar phase angle, ring particle orbital phase (the azimuthal effect), declination of the earth relative to the ring plane (tilt effect), and radial distance from Saturn. Data were obtained using the International Planetary Patrol network when the ring tilt angle B was approximately 16.5, 11.5, and 6 deg, respectively. From the approximately 40,000 original images, 364 were scanned and digitized, along with corresponding calibration exposures. The smearing correction technique used achieved better signal-to-noise by utilizing such constraints as the known width of Cassini's Division on the major axis. The most important observational results were summarized, and included the following: the azimuthal brightness variations for the brighter portion of ring A increased as the ring tilt decreased from B = 26 deg to less than 16 deg, reaching the order of + or 20% with respect to the ansae; they are not detectable for ring B or the outer portion of ring A.

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