Publications
Filter Total Items: 964
Bright carbonate surfaces on Ceres as remnants of salt-rich water fountains Bright carbonate surfaces on Ceres as remnants of salt-rich water fountains
Vinalia and Cerealia Faculae are bright and salt-rich localized areas in Occator crater on Ceres. The predominance of the near-infrared signature of sodium carbonate on these surfaces suggests their original material was a brine. Here we analyze Dawn Framing Camera's images and characterize the surfaces as composed of a central structure, either a possible depression (Vinalia) or a...
Authors
Ottavian Ruesch, Lynnae Quick, Margaret Evelyn Landis, M.M. Sori, O. Cadek, P. Broz, K.A. Otto, Michael T. Bland, S. Byrne, J.C. Castillo-Rogez, H. Hiesinger, R. Jaumann, K. Krohn, L.A. McFadden, A. Nathues, A. Neesemann, F. Preusker, T. Roatsch, P.M. Schenk, J. E. C. Scully, M.V. Sykes, D.A. Williams, C.A. Raymond, C.T. Russell.
Exposed subsurface ice sheets in the Martian mid-latitudes Exposed subsurface ice sheets in the Martian mid-latitudes
Thick deposits cover broad regions of the Martian mid-latitudes with a smooth mantle; erosion in these regions creates scarps that expose the internal structure of the mantle.We investigated eight of these locations and found that they expose deposits of water ice that can be >100 meters thick, extending downward from depths as shallow as 1 to 2 meters below the surface.The scarps are...
Authors
Colin M. Dundas, Ali M Bramson, Lujendra Ojha, James J. Wray, Michael T. Mellon, Shane Byrne, Alfred S. McEwen, N. E. Putzig, Donna Viola, Sarah Sutton, E. Clark, J.W. Holt
Image simulation and assessment of the colour and spatial capabilities of the Colour and Stereo Surface Imaging System (CaSSIS) on the ExoMars Trace Gas Orbiter Image simulation and assessment of the colour and spatial capabilities of the Colour and Stereo Surface Imaging System (CaSSIS) on the ExoMars Trace Gas Orbiter
This study aims to assess the spatial and visible/near-infrared (VNIR) colour/spectral capabilities of the 4-band Colour and Stereo Surface Imaging System (CaSSIS) aboard the ExoMars 2016 Trace Grace Orbiter (TGO). The instrument response functions for the CaSSIS imager was used to resample spectral libraries, modelled spectra and to construct spectrally (i.e., in I/F space) and...
Authors
Livio L. Tornabene, Frank P. Seelos, Antoine Pommerol, Nicolas Thomas, Christy M. Caudill, Patricio Becerra, John C. Bridges, Shane Byrne, Marco Cardinale, Matthew Chojnacki, Susan J. Conway, Gabriele Cremonese, Colin M. Dundas, M. R. El-Maarry, Jennifer Fernando, Candice J. Hansen, Kayle Hansen, Tanya N. Harrison, Rachel Henson, Lucia Marinangeli, Alfred S. McEwen, Maurizio Pajola, Sarah S. Sutton, James J. Wray
Morphological indicators of a mascon beneath Ceres' largest crater, Kerwan Morphological indicators of a mascon beneath Ceres' largest crater, Kerwan
Gravity data of Ceres returned by the National Aeronautics and Space Administration's Dawn spacecraft is consistent with a lower density crust of variable thickness overlying a higher density mantle. Crustal thickness variations can affect the long‐term, postimpact modification of impact craters on Ceres. Here we show that the unusual morphology of the 280 km diameter crater Kerwan may...
Authors
Michael T. Bland, Anton Ermakov, Carol A. Raymond, David A. Williams, Tim J. Bowling, F. Preusker, Ryan S. Park, Simone Marchi, Julie C. Castillo-Rogez, R.R. Fu, Christopher T. Russell
Planetary dune workshop expands to include subaqueous processes Planetary dune workshop expands to include subaqueous processes
Dune-like structures appear in the depths of Earth’s oceans, across its landscapes, and in the extremities of the solar system beyond. Dunes rise up under the thick dense atmosphere of Venus, and they have been found under the almost unimaginably ephemeral atmosphere of a comet.
Authors
Timothy N. Titus, Gerald Bryant, David M. Rubin
Revised recommended methods for analyzing crater size-frequency distributions Revised recommended methods for analyzing crater size-frequency distributions
Impact crater populations crucially help us to understand solar system dynamics, planetary surface histories, and surface modification processes. A single previous effort to standardize how crater data are displayed in graphs, tables, and archives, was in a 1978 NASA report by the Crater Analysis Techniques Working Group, published in 1979 in Icarus. The report had a significant lasting...
Authors
Stuart J. Robbins, Jamie D. Riggs, Brian P. Weaver, Edward B. Bierhaus, Clark R. Chapman, Michelle R. Kirchoff, Kelsi N. Singer, Lisa Gaddis
Detecting geothermal anomalies and evaluating LST geothermal component by combining thermal remote sensing time series and land surface model data Detecting geothermal anomalies and evaluating LST geothermal component by combining thermal remote sensing time series and land surface model data
This paper explores for the first time the possibilities to use two land surface temperature (LST) time series of different origins (geostationary Meteosat Second Generation satellite data and Noah land surface modelling, LSM), to detect geothermal anomalies and extract the geothermal component of LST, the LSTgt. We hypothesize that in geothermal areas the LSM time series will...
Authors
Mireia Romaguera, R. Greg Vaughan, J. Ettema, E. Izquierdo-Verdiguier, C. A. Hecker, van der Meer
Evidence for the interior evolution of Ceres from geologic analysis of fractures Evidence for the interior evolution of Ceres from geologic analysis of fractures
Ceres is the largest asteroid belt object, and the Dawn spacecraft observed Ceres since 2015. Dawn observed two morphologically distinct linear features on Ceres's surface: secondary crater chains and pit chains. Pit chains provide unique insights into Ceres's interior evolution. We interpret pit chains called the Samhain Catenae as the surface expression of subsurface fractures. Using...
Authors
Jennifer E. C. Scully, Debra Buczkowski, Nico Schmedemann, Carol A. Raymond, Julie C. Castillo-Rogez, Scott King, Michael T. Bland, Anton Ermakov, D.P. O’Brien, S. Marchi, A. Longobardo, C.T. Russell, R.R. Fu, M. Neveu
Basalt–trachybasalt samples in Gale Crater, Mars Basalt–trachybasalt samples in Gale Crater, Mars
The ChemCam instrument on the Mars Science Laboratory (MSL) rover, Curiosity, observed numerous igneous float rocks and conglomerate clasts, reported previously. A new statistical analysis of single‐laser‐shot spectra of igneous targets observed by ChemCam shows a strong peak at ~55 wt% SiO2 and 6 wt% total alkalis, with a minor secondary maximum at 47–51 wt% SiO2 and lower alkali...
Authors
Peter H. Edwards, John C. Bridges, Roger C. Wiens, Ryan B. Anderson, M. Darby Dyar, Martin Fisk, Lucy Thompson, Patrick J. Gasda, Justin Filiberto, Susanne P. Schwenzer, Diana L. Blaney, Ian Hutchinson
Preface: The lunar reconnaissance orbiter Preface: The lunar reconnaissance orbiter
When the call for papers for a special issue of Icarus devoted to analysis of data from the Lunar Reconnaissance Orbiter mission was announced in March 2015 we envisioned a single issue with only a possibility of a second. We certainly were gratified by the response from within and outside the LRO instrument teams such that we were compelled to publish this the third and final volume. It...
Authors
John W Keller, Lisa R. Gaddis, Noah E. Petro, Oded Aharonson
Spatial data analytics on heterogeneous multi- and many-core parallel architectures using python Spatial data analytics on heterogeneous multi- and many-core parallel architectures using python
Parallel vector spatial analysis concerns the application of parallel computational methods to facilitate vector-based spatial analysis. The history of parallel computation in spatial analysis is reviewed, and this work is placed into the broader context of high-performance computing (HPC) and parallelization research. The rise of cyber infrastructure and its manifestation in spatial...
Authors
Jason R. Laura, Sergio J. Rey
Community tools for cartographic and photogrammetric processing of Mars Express HRSC images Community tools for cartographic and photogrammetric processing of Mars Express HRSC images
The High Resolution Stereo Camera (HRSC) on the Mars Express orbiter (Neukum et al. 2004) is a multi-line pushbroom scanner that can obtain stereo and color coverage of targets in a single overpass, with pixel scales as small as 10 m at periapsis. Since commencing operations in 2004 it has imaged ~ 77 % of Mars at 20 m/pixel or better. The instrument team uses the Video Image...
Authors
Randolph L. Kirk, Elpitha Howington-Kraus, Kenneth L. Edmundson, Bonnie L. Redding, Donna M. Galuszka, Trent M. Hare, K. Gwinner