Astrogeology Science Center

Publications

Filter Total Items: 869
Publication Thumbnail
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.

Publication Thumbnail
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.

Publication Thumbnail
Year Published: 2020

Preparing for geophysical science on the surface of the moon enabled by Artemis

Geophysical methods have been extremely successful in identifying resources on Earth as they provide a means of characterizing and mapping the sub-surface using data gathered on and above the target structures. Geophysics on the Moon will be an important tool for identifying key targets for geological prospecting, scientific sampling, assessing...

Schmerr, Nicholas; Richardson, Jacob A.; Ghent, R.; Seigler, Matt; Wasser, Molly; Wheeley, Patrick; Buczkowski, D.; Carter, Lynne; Connor, Chuck; Connor, Laura; Bleacher, Jacob E.; Fouch, M.; Baker, D.; Hurford, T.; Jozwiak, L.; Kruse, Sarah; Lekic, V.; Naids, A.; Porter, Ryan; Montesi, L.; Richardson, Derek; Rumpf, M. Elise; Sunshine, J.; Schorghofer, Norbert; Goossens, S.; Whelley, Nicole; Wyrick, D.; Zhu, W.; Bell, Ernie; DeMartini, J.; Coan, D.; Akin, D.; Cohen, Barbara; Mazarico, E.; Neal, Clive; Panning, M.; Petro, Noah; Strauss, B.; Weber, Renee; Glotch, T.; Hendrix, A.; Parker, A.; Wright, Sarah

Publication Thumbnail
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.

Publication Thumbnail
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.

Publication Thumbnail
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.

Publication Thumbnail
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.

Publication Thumbnail
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, M. Elise; Dietterich, Hannah R.

Publication Thumbnail
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

Publication Thumbnail
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

Publication Thumbnail
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.

Publication Thumbnail
Year Published: 2019

Walk in the footsteps of the Apollo astronauts: A field guide to northern Arizona astronaut training sites

Every astronaut who walked on the Moon trained in Flagstaff, AZ. In the early 1960s, scientists at the newly formed United States Geological Survey (USGS) Branch of Astrogeology led this training, teaching geologic principals and field techniques to the astronaut crews. USGS scientists and engineers also developed and tested scientific...

Vaughan, R. Greg; Schindler, Kevin; Stevens, Jeanne; Hough, Ian