Astrogeology Science Center

Publications

Filter Total Items: 839
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Year Published: 2020

Sparse subsurface radar reflectors in Hellas Planitia, Mars

Geomorphological features potentially related to subsurface ice, such as scalloped depressions, expanded craters, pedestal craters, and banded terrain, are present in and around Hellas Planitia, Mars. We present a radar survey of the region using the Shallow Radar (SHARAD) instrument on board the Mars Reconnaissance Orbiter (MRO) to identify...

Cook, Claire W; Bramson, Ali M; Byrne, Shane; Holt, John W; Christoffersen, Michael S; Viola, Donna; Dundas, Colin M.; Goudge, Timothy A

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Year Published: 2020

The Mars Global Digital Dune Database (MGD3): Composition and stability

We present an expansion to the Mars Global Digital Dune Database (MGD3) describing 1) bulk dune field composition determined by fitting a mineral spectral library to Thermal Emission Spectra (TES) data, and 2) a morphologic stability index that measures the degree of non-aeolian modification that has eroded and stabilized each dune field. This...

Fenton, Lori K.; Gullikson, Amber; Hayward, Rosalyn; Charles, Heather; Titus, Timothy N.

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Year Published: 2020

Disk-integrated thermal properties of Ceres measured at the millimeter wavelengths

We observed Ceres at three epochs in 2015 November and 2017 September and October with Atacama Large Millimeter/submillimeter Array (ALMA) 12 m array and in 2017 October with the ALMA Compact Array (ACA), all at ~265 GHz continuum (wavelengths of ~1.1 mm) to map the temperatures of Ceres over a full rotation at each epoch. We also used 2017...

Li, Jian-Yang; Moullet, Arielle; Titus, Timothy N.; Hsieh, Henry H.; Sykes, Mark V.

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Year Published: 2020

Planetary sensor models interoperability using the community sensor model specification

This paper presents the photogrammetric foundations upon which the Community Sensor Model specification depends, describes common coordinate system and reference frame transformations that support conversion between image sensor (charge‐coupled device) coordinates to some arbitrary body coordinate, and describes the U.S. Geological Survey...

Laura, Jason; Mapel, Jesse; Hare, Trent M.

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Year Published: 2020

An aeolian grainflow model for Martian Recurring Slope Lineae

Recurring Slope Lineae (RSL) on Mars have been enigmatic since their discovery; their behavior resembles a seeping liquid but sources of water remain puzzling. This work demonstrates that the properties of RSL are consistent with observed behaviors of Martian and terrestrial aeolian processes. Specifically, RSL are well-explained as flows of sand...

Dundas, Colin M.

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Year Published: 2020

Present-day mass wasting in sulfate-rich sediments in the equatorial regions of Mars

Present-day topographic changes are observed on steep slopes in equatorial regions of Mars that are associated with sulfate-rich sediments. Hydrated sulfates are known to be present in many sedimentary deposits on Mars. We document volume changes in the form of mass movements and gullies over these regions. We have estimated erosion rates of ~12...

Thomas, Melissa F; McEwen, Alfred S.; Dundas, Colin M.

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Year Published: 2020

The mineral diversity of Jezero crater: Evidence for possible lacustrine carbonates on Mars

Noachian-aged Jezero crater is the only known location on Mars where clear orbital detections of carbonates are found in close proximity to clear fluvio-lacustrine features indicating the past presence of a paleolake; however, it is unclear whether or not the carbonates in Jezero are related to the lacustrine activity. This distinction is critical...

Horgan, Briony H. N.; Anderson, Ryan; Dromart, G.; Amador, Elena S.; Rice, Melissa S.

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Year Published: 2020

Community tools for cartographic and photogrammetric processing of Mars Express HRSC images

In this chapter we describe the software we have developed for photogrammetric processing of images from the Mars Express High Resolution Stereo Camera (MEX HRSC) to produce digital topographic models (DTMs) and orthoimages, as well as testing we have performed. HRSC has returned images, including stereo and color coverage of most of Mars at...

Kirk, Randolph L.; Howington-Kraus, Elpitha; Edmundson, Kenneth; Redding, Bonnie L.; Galuszka, Donna M.; Hare, Trent M.; Gwinner, K.

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Year Published: 2019

Analog experiments of lava flow emplacement

Laboratory experiments that simulate lava flows have been in use by volcanologists for many years. The behavior of flows in the lab, where “eruption” parameters, material properties, and environmental settings are tightly controlled, provides insight into the influence of various factors on flow evolution. A second benefit of laboratory lava flows...

Lev, Einat; Rumpf, Mary (Elise); Dietterich, Hannah R.

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Year Published: 2019

Correction to: Report of the IAU Working Group on cartographic coordinates and rotational elements: 2015

We point out some errors in the most recent report from the International Astronomical Union (IAU) Working Group on Cartographic Coordinates and Rotational Elements (Archinal et al. 2018). We correct a sign error in Figs. 1 and 2. We also correct the equation for the prime meridian position (W) of Mars’ satellite Phobos in Table 2.

Archinal, Brent; C. H. Acton; A. Conrad; T. Duxbury; D. Hestroffer; J. L. Hilton; L. Jorda; Kirk, Randolph L.; S. A. Klioner; J-L. Margot; K. Meech; J. Oberst; F. Paganelli; J. Ping; P. K. Seidelmann; A. Stark; D. J. Tholen; Y. Wang; I. P. Williams

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Year Published: 2019

Laser-induced breakdown spectroscopy

Laser-Induced Breakdown Spectroscopy (LIBS) is the remote elemental analysis technique used by the ChemCam instrument on the Curiosity rover. LIBS involves remotely ablating material from rocks and soils with a focused high-energy laser, which generates an optically excited plasma from which the elements in the rock or soil sample are...

Bishop, Janice L; Bell, James F.; Moersch, J.E.; Clegg, Samuel M.; Anderson, Ryan; Melikechi, Noureddine

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Year Published: 2019

Dome formation on Ceres by sold-state flow analogous to terrestrial salt tectonics

The dwarf planet Ceres’s outer crust is a complex, heterogeneous mixture of ice, clathrates, salts and silicates. Numerous large domes on Ceres’s surface indicate a degree of geological activity. These domes have been attributed to cryovolcanism, but that is difficult to reconcile with Ceres’s small size and lack of long-lived heat sources. Here...

Bland, Michael T.; Buczkowski, D. L; Sizemore, H. G.; Ermakov, A. I.; King, S. D; Sori, M. M.; Raymond, C. A.; Castillo-Rogez, J. C.; Russell, C. T.