Publications
Filter Total Items: 960
Titan's fluvial valleys: Morphology, distribution, and spectral properties Titan's fluvial valleys: Morphology, distribution, and spectral properties
Titan's fluvial channels have been investigated based on data obtained by the Synthetic Aperture Radar (SAR) instrument and the Visible and Infrared Mapping Spectrometer (VIMS) onboard the Cassini spacecraft. In this paper, a database of fluvial features is created based on radar-SAR data aiming to unveil the distribution and the morphologic and spectral characteristics of valleys on...
Authors
M.H. Langhans, R. Jaumann, K. Stephan, R. H. Brown, B. J. Buratti, Roger N. Clark, K. H. Baines, P. D. Nicholson, R. D. Lorenz, Laurence A. Soderblom, J.M. Soderblom, Christophe Sotin, J. W. Barnes, R. Nelson
Photometric properties of Vesta Photometric properties of Vesta
The Dawn spacecraft orbited Asteroid (4) Vesta for a year, and returned disk-resolved images and spectra covering visible and near-infrared wavelengths at scales as high as 20 m/pix. The visible geometric albedo of Vesta is ~ 0.36. The disk-integrated phase function of Vesta in the visible wavelengths derived from Dawn approach data, previous ground-based observations, and Rosetta OSIRIS
Authors
Jian-Yang Li, Timothy N. Titus
Characterization of previously unidentified lunar pyroclastic deposits using Lunar Reconnaissance Orbiter Camera (LROC) data Characterization of previously unidentified lunar pyroclastic deposits using Lunar Reconnaissance Orbiter Camera (LROC) data
We used a Lunar Reconnaissance Orbiter Camera (LROC) global monochrome Wide-angle Camera (WAC) mosaic to conduct a survey of the Moon to search for previously unidentified pyroclastic deposits. Promising locations were examined in detail using LROC multispectral WAC mosaics, high-resolution LROC Narrow Angle Camera (NAC) images, and Clementine multispectral (ultraviolet-visible or UVVIS)...
Authors
J. Olaf Gustafson, James F. Bell, Lisa R. Gaddis, B. Ray Hawke, Thomas A. Giguere
Interdisciplinary research produces results in understanding planetary dunes Interdisciplinary research produces results in understanding planetary dunes
Third International Planetary Dunes Workshop: Remote Sensing and Image Analysis of Planetary Dunes; Flagstaff, Arizona, 12–16 June 2012. This workshop, the third in a biennial series, was convened as a means of bringing together terrestrial and planetary researchers from diverse backgrounds with the goal of fostering collaborative interdisciplinary research. The small-group setting...
Authors
Timothy N. Titus, Rosalyn K. Hayward, Cynthia L. Dinwiddie
Temporal observations of bright soil exposures at Gusev crater, Mars Temporal observations of bright soil exposures at Gusev crater, Mars
The Mars Exploration Rover Spirit has discovered bright soil deposits in its wheel tracks that previously have been confirmed to contain ferric sulfates and/or opaline silica. Repeated Pancam multispectral observations have been acquired at four of these deposits to monitor spectral and textural changes over time during exposure to Martian surface conditions. Previous studies suggested...
Authors
M.S. Rice, J.F. Bell, E.A. Cloutis, J.J. Wray, Kenneth E. Herkenhoff, R. Sullivan, J. R. Johnson, R.B. Anderson
Utah's geologic and geomorphic analogs to Mars—An overview for planetary exploration Utah's geologic and geomorphic analogs to Mars—An overview for planetary exploration
Utah offers spectacular geologic features and valuable analog environments and processes for Mars studies. Horizontal strata of the Colorado Plateau are analogous to Mars because the overprint of plate tectonics is minimal, yet the effects of strong ground motion from earthquakes or impacts are preserved in the sedimentary record. The close proximity of analog environments and lack of...
Authors
Marjorie A. Chan, Kathleen Nicoll, Jens Ormö, Chris Okubo, Goro Komatsu
Europa awakening Europa awakening
Brines percolating in the icy crust of Jupiter's moon Europa may be responsible for the satellite's enigmatic chaotic terrains. A new model predicts that one such terrain is currently forming over shallow subsurface water.
Authors
Laszlo P. Keszthelyi
Regional geomorphology and history of Titan's Xanadu province Regional geomorphology and history of Titan's Xanadu province
Titan’s enigmatic Xanadu province has been seen in some detail with instruments from the Cassini spacecraft. The region contains some of the most rugged, mountainous terrain on Titan, with relief over 2000 m. Xanadu contains evolved and integrated river channels, impact craters, and dry basins filled with smooth, radar-dark material, perhaps sediments from past lake beds. Arcuate and...
Authors
J. Radebaugh, R. D. Lorenz, S. D. Wall, R. L. Kirk, C. A. Wood, J. I. Lunine, E. R. Stofan, R M.C. Lopes, P. Valora, T.G. Farr, A. Hayes, B. Stiles, Giuseppe Mitri, H. Zebker, M. Janssen, L. Wye, A. LeGall, K. L. Mitchell, F. Paganelli, R.D. West, E.L. Schaller
Estimating eruption temperature from thermal emission spectra of lava fountain activity in the Erta'Ale (Ethiopia) volcano lava lake: Implications for observing Io's volcanoes Estimating eruption temperature from thermal emission spectra of lava fountain activity in the Erta'Ale (Ethiopia) volcano lava lake: Implications for observing Io's volcanoes
We have analysed high-spatial-resolution and high-temporal-resolution temperature measurements of the active lava lake at Erta'Ale volcano, Ethiopia, to derive requirements for measuring eruption temperatures at Io's volcanoes. Lava lakes are particularly attractive targets because they are persistent in activity and large, often with ongoing lava fountain activity that exposes lava at...
Authors
Ashley G. Davies, Laszlo P. Keszthelyi, Alfred S. McEwen
Transient surface liquid in Titan's south polar region from Cassini Transient surface liquid in Titan's south polar region from Cassini
Cassini RADAR images of Titan’s south polar region acquired during southern summer contain lake features which disappear between observations. These features show a tenfold increases in backscatter cross-section between images acquired one year apart, which is inconsistent with common scattering models without invoking temporal variability. The morphologic boundaries are transient...
Authors
A. G. Hayes, O. Aharonson, J. I. Lunine, R. L. Kirk, H. A. Zebker, L. C. Wye, R. D. Lorenz, E. P. Turtle, P. Paillou, Giuseppe Mitri, S. D. Wall, E. R. Stofan, K. L. Mitchell, C. Elachi
Massive CO2 ice deposits sequestered in the south polar layered deposits of Mars Massive CO2 ice deposits sequestered in the south polar layered deposits of Mars
Shallow Radar soundings from the Mars Reconnaissance Orbiter reveal a buried deposit of carbon dioxide (CO2) ice within the south polar layered deposits of Mars with a volume of 9500 to 12,500 cubic kilometers, about 30 times that previously estimated for the south pole residual cap. The deposit occurs within a stratigraphic unit that is uniquely marked by collapse features and other...
Authors
Roger J. Phillips, Brian J. Davis, Kenneth L. Tanaka, Shane Byrne, Michael T. Mellon, Nathaniel E. Putzig, Robert M. Haberle, Melinda A. Kahre, Bruce A. Campbell, Lynn M. Carter, Isaac B. Smith, John W. Holt, Suzanne E. Smrekar, Daniel C. Nunes, Jeffrey J. Plaut, Anthony F. Egan, Timothy N. Titus, Roberto Seu
Field Reconnaissance Geologic Mapping of the Columbia Hills, Mars: Results from MER Spirit and MRO HiRISE Observations Field Reconnaissance Geologic Mapping of the Columbia Hills, Mars: Results from MER Spirit and MRO HiRISE Observations
Chemical, mineralogic, and lithologic ground truth was acquired for the first time on Mars in terrain units mapped using orbital Mars Reconnaissance Orbiter's High Resolution Imaging Science Experiment (MRO HiRISE) image data. Examination of several dozen outcrops shows that Mars is geologically complex at meter length scales, the record of its geologic history is well exposed...
Authors
L.S. Crumpler, R. E. Arvidson, S. W. Squyres, T. McCoy, A. Yingst, S. Ruff, W. Farrand, Y. McSween, M. Powell, D. W. Ming, R.V. Morris, J.F. Bell, J. Grant, R. Greeley, D. DesMarais, M. Schmidt, N.A. Cabrol, A. Haldemann, Kevin W. Lewis, A.E. Wang, C. Schroder, D. Blaney, B. Cohen, A. Yen, J. Farmer, Ralf Gellert, E.A. Guinness, K. E. Herkenhoff, J. R. Johnson, G. Klingelhofer, A. McEwen, J. W. Rice, M. Rice, P. deSouza, J. Hurowitz