Uranian ring photometry - Results from Voyager 2

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photometry, Spaceborne Photography, Uranus Rings, Voyager 2 Spacecraft, Albedo, Astronomical Models, Interplanetary Dust, Radiative Transfer, Reflectance, Spacecraft Instruments

Scientific paper

The rings of Uranus are characterized on the basis of an analysis of seven images obtained with a clear filter by Voyager 2 during its encounter with Uranus in January 1986. The data are presented graphically and compared with the predictions of theoretical models with different particle size distributions. Parameters determined include average particle Bond albedo 0.014 + or - 0.004, fractional area of the main rings in dust-size particles 0.002 or less, and average dust-particle size 1.0 + or - 0.3 microns for a Hansen-Hovenier (1974) distribution and a power-law distribution of spherical particles with spectral index 2.5 + or - 0.5.

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