Stellar occultation probes of the Uranian rings at 0.1 and 2.2 microns - A comparison of Voyager UVS and earth-based results

Details Stellar occultation probes of the Uranian rings at 0.1 and 2.2 microns - A comparison of Voyager UVS and earth-based results Stellar occultation probes of the Uranian rings at 0.1 and 2.2 microns - A comparison of Voyager UVS and earth-based results

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94..178h&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 94, July 1987, p. 178-188.

Astronomy and Astrophysics

Astronomy

24

Astronomical Spectroscopy, Spaceborne Astronomy, Stellar Occultation, Ultraviolet Spectra, Uranus Rings, Ground Truth, Optical Thickness, Spatial Resolution, Voyager 2 Spacecraft, Uranus, Rings, Occultations, Comparisons, Spacecraft Observations, Size, Voyager 2, Earth-Based Observations, Ultraviolet, Wavelengths, Depth, Spectrometry, Optical Properties, Composition, Particles, Epsilon Ring, 1986U1 Ring, Delta Ring, Geometry, Diagrams, Intensity, Pps, Rss, Photopolarimetry Subsystem, Radio Science Subsystem

Scientific paper

A comparison between Voyager 2 UV spectrometer data for stellar occultations of the Uranian ring system obtained at 0.11 microns and 2.2-micron earth-based occultation data reveals the anticipated factor-of-two reduction in observed optical depths relative to those observed from earth. This is due to Voyager's proximity to the rings, which allows light diffracted out of the direct beam by ring particles to be replaced by light diffracted into the direct beam light from other particles, and further permits the placing of firm lower limits on typical particle sizes of 0.3 and 1 cm for the epsilon and delta rings, respectively. As a function of true anomaly, the epsilon ring profile is noted to remain very similar in shape and essentially constant in equivalent depth, even very near periapse.

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