Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984crasb.298..639g&link_type=abstract
Academie des Sciences (Paris), Comptes Rendus, Serie II Mecanique, Physique, Chimie, Sciences de l'Univers, Sciences de la Terre
Astronomy and Astrophysics
Astronomy
Astronomical Photography, Saturn Rings, Astronomical Photometry, Halos, Space Observations (From Earth), Turbulence Effects, Variability
Scientific paper
A division that has been observed between the Saturn C and D rings using ground-based telescopes was not detected by the Voyager spacecraft. The ground-based observations have never been collaborated with negatives or visual observations. It is therefore possible that the perceived division is a result of the graininess of the photographic emulsions. However, digitization of the microdensitometry of the positives supports the presence of the D ring. It can also be shown that an Eberhard halo does not form in developing the positives. Processing the Voyager imager according to luminance alone supports the existence of the D ring, which may in actuality be temporally variable and therefore may not have been visually pronounced during passage of the spacecraft. More photographs are needed in low atmospheric turbulence conditions to detect variations in the luminosity of the D ring.
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