Lisa R. Gaddis

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The 5-band Clementine UVVIS data at 100 m/pixel were used to examine the compositions of 75 large and small lunar pyroclastic deposits (LPDs), and these were compared to representative lunar maria and highlands deposits. Results show that the albedo, spectral color, and inferred composition of most LPDs are similar to those of low-titanium, mature lunar(More)
The Galileo spacecraft imaged parts of the western limb and far side of the Moon in December 1990. Ratios of 0.41/0.56 gin filter images from the Solid State hnaging (SSI) experiment provided information on the titanium content of mare deposits' ratios of the 0.76/0.99 gm images indicated 1 gin absorptions as ociated with Fe 2+ in mafic minerals. Mare ages(More)
Ken E. Herkenhoff, John Grotzinger, Andrew H. Knoll, Scott M. McLennan, Catherine Weitz, Aileen Yingst, Robert Anderson, Brent A. Archinal, Raymond E. Arvidson, Janet M. Barrett, Kris J. Becker, James F. Bell III, Charles Budney, Mary G. Chapman, Debbie Cook, Bethany Ehlmann, Brenda Franklin, Lisa R. Gaddis, Donna M. Galuszka, Patricia A. Garcia, Paul(More)
The initial spacecraft exploration of the Moon in the 1960s–70s yielded extensive data, primarily in the form of film and television images, which were used to produce a large number of hardcopy maps by conventional techniques. A second era of exploration, beginning in the early 1990s, has produced digital data including global multispectral imagery and(More)
Introduction: Lunar deposits of pyroclastic material, referred to as dark mantle deposits (DMDs), are fine-grained, low-albedo volcanic materials [1]. Previous studies identified over 100 DMDs across the lunar surface, ranging from ~10-50,000 km [2,3]. The largest of these are known as “regional” DMDs, while the smaller are “localized” DMDs [4]. DMDs are(More)
The Microscopic Imager on the Spirit rover analyzed the textures of the soil and rocks at Gusev crater on Mars at a resolution of 100 micrometers. Weakly bound agglomerates of dust are present in the soil near the Columbia Memorial Station. Some of the brushed or abraded rock surfaces show igneous textures and evidence for alteration rinds, coatings, and(More)
The Microscopic Imager on the Opportunity rover analyzed textures of soils and rocks at Meridiani Planum at a scale of 31 micrometers per pixel. The uppermost millimeter of some soils is weakly cemented, whereas other soils show little evidence of cohesion. Rock outcrops are laminated on a millimeter scale; image mosaics of cross-stratification suggest that(More)
Images of the martian surface returned by the Imager for Mars Pathfinder (IMP) show a complex surface of ridges and troughs covered by rocks that have been transported and modified by fluvial, aeolian, and impact processes. Analysis of the spectral signatures in the scene (at 440- to 1000-nanometer wavelength) reveal three types of rock and four classes of(More)
Introduction: High shock pressures disorder the mineral lattice of plagioclase feldspars and cause weakening and shifts in thermal infrared absorption bands related to an increase in diaplectic glass content, particularly at shock pressures above ~20-25 GPa [1-9]. We are continuing our investigation of spectral deconvolutions of TES mosaics and mosaics(More)