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New Cloud Activity on Uranus in 2004: First Detection of a Southern Feature at 2.2 microns

Description: On 4 July 2004 UT, we detected one of Uranus' southern hemispheric features at K' (2.2 {micro}m); this is the first such detection in half a decade of adaptive optics imaging of Uranus at the Keck 10-m telescope. When we observed again on 8 July UT the core had faded, and by 9 July UT it was not seen at K' and barely detectable at H. The detection and subsequent disappearance of the feature indicates rapid dynamical processes in the localized vertical aerosol structure.
Date: February 2, 2005
Creator: Hammel, H. B.; de Pater, I.; Gibbard, S.; Lockwood, G. & Rages, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The Ring System of Uranus: Flat as a Pancake, Sprinkled with Dust

Description: We present a high quality image of the uranian ring system, obtained in July 2004 at 2.2 {micro}m with the adaptive optics camera NIRC2 on the Keck II telescope. Using these data, we report the first ground-based image of the ring 1986U2R, seen only once before by the Voyager spacecraft. We show that this ring extends inward to {approx} 7000 km above the Uranus cloud deck. Its VIF (total vertically integrated I/F) is {approx} 100 m. We further detected narrow sheets of dust in between the {delt… more
Date: February 2, 2005
Creator: de Pater, I; Gibbard, S G & Hammel, H B
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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