Occultation of U138 by Uranus' Rings

Details Occultation of U138 by Uranus' Rings Occultation of U138 by Uranus' Rings

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997dps....29.1716s&link_type=abstract

American Astronomical Society, DPS meeting #29, #17.16; Bulletin of the American Astronomical Society, Vol. 29, p.1001

Astronomy and Astrophysics

Astronomy

Scientific paper

The occultation by Uranus of U138 (SAO 163583; Klemola and Mink, 1991, Astron. J. 102, 389) was observed on 10 April 1996 using the Faint Object Spectrograph on the Hubble Space Telescope. The epsilon ring was observed on ingress, while 6, 5, 4, alpha , beta , eta , gamma , delta , and lambda were clearly detected during egress. One of the strengths of this occultation observation is the fact that it is spectrally resolved, including data over a wavelength range of 3546 - 7080 Angstroms with resolution 25 Angstroms. The unusually high signal-to- noise ratio of these data allows detection of optically thin features normally hidden in the noise as well as calculation of equivalent depths for at least 140 different wavelength bins over this range. We use these exceptional data to explore several characteristics of the rings: the azimuthal asymmetry of the lambda ring, the particle size distributions in all rings (via dependence of equivalent depth on wavelength), and the structure of the delta - and eta -ring shelves.

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