Astrogeology Science Center

Publications

Filter Total Items: 860
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Year Published: 2020

A newly emerging thermal area in Yellowstone

Yellowstone is a large restless caldera that contains many dynamic thermal areas that are the surface expression of the deeper magmatic system. In 2018, using a Landsat 8 nighttime thermal infrared image, we discovered the emergence of a new thermal area located near Tern Lake on the northeast margin of the Sour Creek dome. A high-spatial-...

Vaughan, R. Greg; Hungerford, Jefferson; Keller, Bill

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Year Published: 2020

The Moon as a climate-quality radiometric calibration reference

On-orbit calibration requirements for a space-based climate observing system include long-term sensor response stability and reliable inter-calibration of multiple sensors, both contemporaneous and in succession. The difficulties with achieving these for reflected solar wavelength instruments are well known. The Moon can be considered a diffuse...

Stone, Thomas C.; Kieffer, Hugh H.; Lukashin, Constantine; Turpie, Kevin

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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

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, Mary (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

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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.