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The Uranus system from occultation observations (1977-2006): Rings, pole direction, gravity field, and masses of Cressida, Cordelia, and Ophelia
Nicholson, Philip D.; French, Richard G.; Hedman, Matthew M. +2 more
From an analysis of 31 Earth-based stellar occultations and three Voyager 2 occultations spanning 1977-2006 (French et al. 2023a), we determine the keplerian orbital elements of the centerlines of the nine main Uranian rings to high accuracy, with typical RMS residuals of 0.2-0.4 km and 1- σ formal errors in a , ae , and a sin i of order 0.1 km, r…
A study of Jupiter's UV Great Dark Spot and tropopause to stratosphere winds in the high northern latitudes as seen by Cassini imaging
West, R. A.; Sinclair, J. A.; Del Genio, A. D. +1 more
Images of Jupiter taken during the year 2000 Cassini flyby revealed the early stages and evolution of a high northern-latitude UV Great Dark Spot over a three-month period. They also provided a window on the circulation of Jupiter's polar stratosphere. Jupiter's rarely-detected UV Great Dark Spot (UVGDS) is unusual in several respects. It is an ep…
Ultraviolet spectrum reveals the presence of ozone on Jupiter's moon Callisto
Janardhan, P.; Bhardwaj, Anil; Ramachandran, R. +11 more
Sulphur dioxide (SO2) is known to be present on Callisto. In this paper, we studied the chemical evolution of SO2 astrochemical ice induced by irradiation using 9 eV (137.7 nm) vacuum ultraviolet light produced from the high-flux beamline of the storage ring at the National Synchrotron Radiation Research Centre in Taiwan. Ult…
The puzzling north polar region of Uranus: Continued zero-shear winds and increasing brightness from 2015 through 2022 according to 7 years of Keck AO imaging
de Pater, Imke; Sromovsky, Lawrence A.; Fry, Patrick M. +1 more
There may be a permanent north–south asymmetry in the zonal wind profile of Uranus. According to high signal-to-noise near-IR observations with the Keck telescope NIRC2 camera, through 2014 the winds north of 60∘N had a constant (zero shear) longitudinal drift rate of 4.1∘/h westward (Sromovsky et al., 2015). Yet the south polar winds in 1986 had …
Overview of a large observing campaign of Jupiter's aurora with the Hubble Space Telescope combined with Juno-UVS data
Bonfond, B.; Nichols, J. D.; Gérard, J. -C. +8 more
Between February and September 2019, Jupiter's ultraviolet aurorae were frequently observed during a large campaign of the Hubble Space Telescope (HST GO-15638). The campaign included approximately 10 visits around each of the perijoves of the Juno spacecraft orbits 18 to 22 around Jupiter. During this time, the solar activity was minimal, giving …