Search Publications
ISOCAM Imaging of Comets 65P/Gunn and 46P/Wirtanen
Fulle, M.; Mennella, V.; Colangeli, L. +4 more
In this paper we present images of Comets 65P/Gunn and 46P/Wirtanen obtained by means of ISOCAM in the broadband filters at 9.62 (LW7) and 15.00 µm (LW3). The observations were performed on 23 March 1996 and on 9 November 1996, respectively. The aim of this work is to analyze the coma and tail dust environment of the targets. The application…
The Ultraviolet Albedo of Titan
Smith, T. Ed; Feldman, Paul D.; Strobel, Darrell F. +2 more
Ultraviolet spectra of Titan obtained with the Faint Object Spectrograph of the Hubble Space Telescope in October 1991 and August 1992 have yielded a disk-average geometric albedo of 0.02-0.044 from 1800-3300 Å. These results are in excellent agreement with previous UV measurements from 2200-3300 Å spanning two decades, but have a significantly hi…
Dynamics and Interaction between a Large-Scale Vortex and the Great Red SPOT in Jupiter
Hueso, R.; Rojas, J. F.; Colas, F. +5 more
A unique large-scale vortex, the White Tropical Oval (WTrO), was first observed in the South Tropical Zone of Jupiter, at the latitude of the Great Red Spot (GRS) in 1983. Its origin is probably related to a period of intense formation of eddies in the Southern edge of the South Equatorial Belt at latitude -20°. The WTrO survived many changes in t…
Asteroid Trails in Hubble Space TelescopeWFPC2 Images: First Results
Ballester, Gilda E.; Grillmair, Carl; Crisp, David +21 more
Careful examination of 28,460 selected Wide Field and Planetary Camera 2 (WFPC2) long exposures from 1994, 1995, and early 1996 has revealed trails of 96 distinct moving objects. They have been reported to the International Astronomical Union's (IAU) Minor Planet Center for their asteroid database and a few have been identified with known asteroid…
Geologic Mapping of Vesta from 1994 Hubble Space Telescope Images
Wells, Eddie N.; Storrs, Alex D.; Thomas, Peter C. +3 more
We utilize the 56 images of Asteroid 4 Vesta obtained through four mineralogically diagnostic filters by the Hubble Space Telescope (Zellneret al.1997,Icarus) to construct a geologic map. Vesta's surface is found to be geologically diverse and to be dichotomous at a hemispheric scale. The eastern hemisphere (longitude definition from Thomaset al.1…
The Dependence of the Circumnuclear Coma Structure on the Properties of the Nucleus
Rodionov, A. V.; Crifo, J. F.
A new step of development of the 3-D circumnuclear coma (“CNC”) model described in Crifoet al.(1995) is presented: now the gas and dust production are computed from an explicit dusty-ice sublimation model and a realistic dust mass spectrum is used. For the first time, (1) a clear distinction is made betweennucleus active area fraction gandactive s…
Vesta: Spin Pole, Size, and Shape from HST Images
Storrs, Alex D.; Thomas, Peter C.; Binzel, Richard P. +3 more
HST images obtained over an interval of 71 hr at a scale of 52 km/pixel have been used to determine the spin pole, size, and shape of Vesta. Several bright and dark surface features allow control point stereogrammetric measurement of spin pole orientation. An independent solution of spin pole and shape can be made from the limb and terminator coor…
Separate Lightcurves of Pluto and Charon
Buie, Marc W.; Wasserman, Lawrence H.; Tholen, David J.
We present new Hubble Space Telescope observations of the Pluto-Charon system taken with WFPC1 (PC6) between 1992 May 21 and 1993 August 18. Our observations consist of 52 images with the F555W filter and 8 images in the F439W filter. From these data we extracted individual lightcurves, phase coefficients, and colors for Pluto and Charon. These li…
ISO Observations of Interstellar Ices and Implications for Comets
Ehrenfreund, P.; Dartois, E.; Habing, H. J. +4 more
We report on first ISO observations of interstellar ices in the direction of the protostellar object RAFGL 7009S. Due to its extreme extinction this source represents a unique target for the detection of interstellar ices. Identified molecules include H2O, CO, and CO2together with13CO2, CH4, O…
Volcanic Resurfacing of Io: Post-Repair HST Imaging
Gilmore, Diane; McGrath, Melissa A.; Spencer, John R. +4 more
In March 1994, we used the newly refurbished Hubble Space Telescope (HST) to obtain global imaging of Io at five wavelengths between 0.34 and 1.02 µm, with a spatial resolution of 160 km. The images provided the clearest view of Io since Voyager and the first systematic observations in the wavelength range 0.7-1.0 µm. We have produced …