The 1 May 1982 stellar occultation by Uranus and the rings: Observations from Mount Stromlo Observatory |
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| Institution: | 1. Space Physics Laboratory, VSSC, Indian Space Research Organisation, Trivandrum, India;2. Physical Research Laboratory, Navarangpura, Ahmedabad, India;3. Central Instruments Laboratory, University of Hyderabad, India;4. Laboratory for Electro Optical Systems, Indian Space Research Organisation, Bangalore, India;1. Università di Napoli “Federico II”;2. INFN sezione di Napoli;1. K.U. Leuven, Institute for Nuclear and Radiation Physics, Celestijnenlaan 200 D, B-3001 Leuven, Belgium;2. imec, Kapeldreef 75, B-3001 Leuven, Belgium |
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| Abstract: | The 1 May 1982 occultation of KME 15 by Uranus and its rings was observed at λ = 2.2 μm using the 1.9-m telescope of the Mount Stromlo Observatory. From model fits to the immersion and emersion ring profiles, accurate midtimes for rings 6, 5, 4, α, β, η, γ, σ, and ?, and ring widths, equivalent widths, and normal optical depths for all but ring 6 were obtained. The recently discovered ring 1986 U1R is not detectable in the data, setting an upper limit on the product of ring width and normal optical depth of ≤0.4 km at λ = 2.2 μm. From the immersion and emersion atmosphere occultations, vertical temperature profiles were obtained by numerical inversion. Both profiles show mean temperatures near 130°K and a local maximum near the 8-μbar pressure level. |
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