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Coordinated 1996 HST and IRTF Imaging of Neptune and Triton. I. Observations, Navigation, and Differential Deconvolution
Baines, K. H.; Sromovsky, L. A.; Fry, P. M. +3 more
On 13-14 August 1996, we carried out the first coordinated contemporaneous imaging of Neptune, using the Hubble Space Telescope (HST) Wide Field Planetary Camera 2 and the NASA Infrared Telescope Facility (IRTF) NSFCAM InSb camera to obtain high spatial resolution absolutely calibrated imagery at wavelengths from 0.2 to 2.5 µm. We used nine …
Middle Ultraviolet Spectroscopy of Pluto and Charon
Krasnopolsky, Vladimir A.
The first Pluto's spectrum in the range 2000 to 2500 Å has been extracted from the Hubble Space Telescope (HST) archive observations acquired during 24 orbits. Although the spectral intensity is very weak and smaller than that for Titan by a factor of 100, the spectrum has a signal-to-noise ratio of 10-15 at the resolution of 10 Å. The mean geomet…
Photometric Modeling of the Epsilon Ring of Uranus and Its Spacing of Particles
Karkoschka, Erich
The ring model of Irvine (1966, J. Geophys. Res.71, 2931-2937) is used to explain the longitudinal brightness variation of the ɛ ring of Uranus observed by Voyager 2 and with the Hubble Space Telescope, while basic ring properties are based on occultation data. The observations span a factor of 600 in the range of phase angles (0.03-20°) which all…
The Analysis of the H Lyman α Emission Line Profile from Jupiter's Aurora
Ballester, Gilda E.; Prangé, Renée; Clarke, John T. +3 more
We present the analysis and modeling of the emission spectra of the jovian northern auroral region taken from May 28 to June 3, 1993, with the Goddard High Resolution Spectrograph on board the Hubble Space Telescope. They extend from 1204 to 1240 Â covering H Lyman α and part of the Werner and the Lyman bands of H 2. We used the 2×2 arc…
HST/FOC Imaging of Triton
Stern, S. A.; Stansberry, J.; Flynn, B. +1 more
We present an analysis of HST/FOC images of Triton obtained on 20-24 September 1995. Images were taken in two wavelength bands using the F278M and F410M filters in order to obtain the first mid-UV map of Triton and to place further compositional constraints on Triton's surface by imaging farther into the UV than did Voyager. Our disk-resolved imag…
AAT Observations of the SL9 Fragment C, D, G, K, N, R, V, and W Impacts with Jupiter: Lightcurves and Imaging
Crisp, David; Spencer, John; Orton, Glenn +2 more
We used the InfraRed Imaging Spectrometer (IRIS) on the Anglo-Australian Telescope to monitor the July 1994 impacts of Comet Shoemaker-Levy 9 with Jupiter. Spectral image cubes were obtained for the impacts of fragments C, D, G, K, R, and W. These data provide time sequences of spatially resolved spectra in K-band (1.98 to 2.40 µm), with a s…
Ground-Based Observations of the 10 August 1995 Saturn Ring-Plane Crossing
Nicholson, Philip D.; Matthews, Keith; McGregor, Peter J. +2 more
Observations at 2.3 µm at the Australian National University 2.3-m telescope at Siding Spring Observatory and the 5-m Hale telescope at Palomar Observatory from 9 to 17 August provide a longer baseline of time around the 10 August 1995 Saturn ring-plane crossing than space-based observations. The edge-on photometric thickness of the rings at…
Photochemistry of Saturn's Atmosphere. I. Hydrocarbon Chemistry and Comparisons with ISO Observations
Bézard, Bruno; Lellouch, Emmanuel; Moses, Julianne I. +3 more
To investigate the details of hydrocarbon photochemistry on Saturn, we have developed a one-dimensional diurnally averaged model that couples hydrocarbon and oxygen photochemistry, molecular and eddy diffusion, radiative transfer, and condensation. The model results are compared with observations from the Infrared Space Observatory (ISO) to place …
Photochemistry of Saturn's Atmosphere. II. Effects of an Influx of External Oxygen
Bézard, Bruno; Lellouch, Emmanuel; Moses, Julianne I. +3 more
We use a one-dimensional diurnally averaged model of photochemistry and diffusion in Saturn's stratosphere to investigate the influence of extraplanetary debris on atmospheric chemistry. In particular, we consider the effects of an influx of oxygen from micrometeoroid ablation or from ring-particle diffusion; the contribution from cometary impacts…
Saturn's Zonal Winds at Cloud Level
Sada, Pedro V.; Sanchez-Lavega, Agustín.; Rojas, José F.
We present an analysis of new cloud motion measurements in Saturn's atmosphere from Voyager 1 and 2 images and define a nominal zonal wind velocity vs latitude profile for the cloud top level that can be used as reference for the upcoming Cassini mission. Improvements over previous studies include: (i) twice the number of wind vectors used, (ii) i…