Other
Scientific paper
Apr 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976crasb.282..317g&link_type=abstract
Academie des Sciences (Paris), Comptes Rendus, Serie B - Sciences Physiques, vol. 282, no. 14, Apr. 5, 1976, p. 317-320. In Fre
Other
Astronomical Photometry, Saturn Rings, Astronomical Photography, Calibrating, Data Reduction, Isotopic Labeling, Luminous Intensity, Microphotographs
Scientific paper
The paper describes a method for the two-dimensional reduction of photographs of Saturn which consists of scans in successive lines followed by a treatment of the curvature of the rings, transforming the arcs of ellipses into straight lines. This allows photometry of the four rings to be undertaken along their major axis taking account of measurements on each side of it. Three noncalibrated composite photographs developed from yellow-light negatives obtained in 1969 and 1972 were reduced in the manner described as were three calibrated negatives, one in violet light, obtained in 1975, the two others in yellow light obtained in 1972.
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