Search Publications
Water Vapor Saturation at Low Altitudes around Mars Aphelion: A Key to Mars Climate?
Clancy, R. T.; Wolff, M. J.; Grossman, A. W. +6 more
The combined analysis of microwave temperature and water profiling of the Mars atmosphere indicates that low- to mid-latitude water vapor saturation typically occurs at much lower altitudes (below 10 km) during northern spring/summer than observed during this Mars aphelion season in the dusty, warm period of Viking observations (above 25 km). Temp…
Titan's Surface, Revealed by HST Imaging
Lorenz, R. D.; Sromovsky, L. A.; Caldwell, J. J. +3 more
We present for the first time relative albedo maps of Titan's surface. The maps were made from images taken by the Hubble Space Telescope's planetary camera (295 km per pixel) through atmospheric windows at 940 and 1080 nm. Coverage at all longitudes and between 45°S and 60°N was obtained with 14 orbits from 4-18 October 1994. Each image is charac…
The Discovery and Orbit of 1993 (243)1 Dactyl
Petit, Jean-Marc; Mueller, Beatrice E. A.; Neukum, Gerhard +18 more
Dactyl was discovered in solid state imaging (SSI) data on February 17, 1994, during the long playback of approach images from the Galileo spacecraft's encounter with the asteroid 243 Ida. Forty-seven images of the Ida-Dactyl pair were obtained. A detailed search for other satellites was made. No confirmed detections were made, all other candidate…
SO 2Distributions on Io
McGrath, Melissa A.; Belton, Michael J. S.; Sartoretti, Paola
We present an analysis of disk-resolved images of Io at 232.5, 260, and 285 nm taken with the FOC (Faint Object Camera) of the Hubble Space Telescope. The images at 232.5 and 260 nm were acquired in 1993 in an effort to separate the surface and SO2atmosphere contributions to the observed UV albedo. We combine these images to make UV col…
Jovian Tropospheric Features—Wind Field, Morphology, and Motion of Long-Lived Systems
Simon, Amy A.; Beebe, Reta F.
A map spanning 360° of longitude and +5° to -65° latitude has been constructed from Hubble Space Telescope SL-9 Campaign F410M images obtained on July 23, 1994 with the WFPC2 in PC and WF mode. For comparison, a map spanning +65° to -65° has been generated from WFPC2 PC observations on February 17, 1995. Because the WFPC2 data has the highest spat…
Ultraviolet Spectroscopy of the SL9 Impact Sites. I. The 175-230 nm Region
McGrath, Melissa A.; Yelle, Roger V.
We present a comprehensive analysis of spectra in the 175-230 nm wavelength region obtained by the Faint Object Spectrograph of the Hubble Space Telescope (HST) to determine the abundance of molecular species in the vicinity of the G and L impact sites. Data were obtained on July 18, roughly 3 hr after the G impact, on August 9, and on August 23. …
Observations of Comet P/Faye 1991 XXI with the Planetary Camera of the Hubble Space Telescope
Lamy, P. L.; Keller, H. U.; Toth, I. +3 more
Comet P/Faye 1991 XXI (1991 n) was observed with the planetary camera (PC) of the Hubble Space Telescope (HST) between October 29 and November 21, 1991, when its geocentric distance was in the range 0.62-0.67 AU. The resulting high resolution-a single PC pixel projected to a distance of ∼20 km at the comet-made it possible to clearly discriminate …
Absolute Reflectivity Spectra of Jupiter: 0.25--3.5 Micrometers
Baines, K. H.; Nicholson, P. D.; Simon, A. A. +6 more
The world-wide observing campaign of the Comet P/Shoemaker-Levy 9 (SL9) impacts into Jupiter during July 1994 has led to an unprecedented quantity of imaging data, predominantly in the visible to near-infrared wavelength regime. In an effort to provide reference brightness values for Jupiter at all latitudes, we present a compilation of absolute r…
Analysis of Jovian Auroral H Ly-α Emission (1981-1991)
Ballester, Gilda E.; McGrath, Melissa A.; Clarke, John T. +1 more
We present a new analysis of jovian auroral IUE spectra covering the period from 1981 to 1991. To extract integrated auroral H Ly-α emission from these spectra we have developed a new extraction method that bins signal with wavelength while preserving the spatial information provided by the IUE imaging spectrograph. This separates auroral emission…
Seasonal Recession of Martian South Polar Cap: 1992 HST Observations
Clancy, R. Todd; James, Philip B.; Lee, Steven W. +2 more
The seasonal recession of the south polar cap of Mars has been studied using the Wide Field Planetary Camera images from Hubble Space Telescope obtained during the summer of 1992 when the angular size of Mars was between 5 and 6 arc sec. The observations cover the interesting period betweenLS= 259 and 284, when the recession is rapid an…