Astrogeology Science Center

Publications

Filter Total Items: 836
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Year Published: 2021

Exposure of an early to middle Noachian valley network in three dimensions on Mars

We document a set of channels in a section of the Martian cratered highlands located between crustal massifs northeast of Hellas Planitia that are visible in cross section and planview >200 m below the surface. The morphometry and spatial distribution of the outcrops provide concrete geological evidence of a dynamic aqueous system in a...

Skinner, James A.; Fortezzo, Corey M.; Mouginis-Mark, Peter J.

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Year Published: 2020

Compositional layering in Io driven by magmatic segregation and volcanism

The compositional evolution of volcanic bodies like Io is not well understood. Magmatic segregation and volcanic eruptions transport tidal heat from Io's interior to its surface. Several observed eruptions appear to be extremely high temperature (≥ 1600 K), suggesting either very high degrees of melting, refractory source regions, or intensive...

Spencer, Dan C; Katz, Richard F.; Hewitt, Ian J.; May, David A.; Kestay, Laszlo P.

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Year Published: 2020

Evaluating stereo DTM quality at Jezero Crater, Mars with HRSC, CTX, and HiRISE images

We have used a high-precision, high-resolution digital terrain model (DTM) of the NASA Mars 2020 rover Perseverance landing site in Jezero crater based on mosaicked images from the Mars Reconnaissance Orbiter High Resolution Imaging Science Experiment (MRO HiRISE) camera as a reference dataset to evaluate DTMs based on Mars Express High...

Kirk, Randolph L.; Fergason, Robin L.; Redding, Bonnie L.; Galuszka, Donna M.; Smith, Ethan; Mayer, David; Hare, Trent M.; Gwinner, Klaus

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Year Published: 2020

Ancient Martian aeolian sand dune deposits recorded in the stratigraphy of Valles Marineris and implications for past climates

Aeolian sediment transport, deposition, and erosion have been ongoing throughout Mars's history. This record of widespread aeolian processes is preserved in landforms and geologic units that retain important clues about past environmental conditions including wind patterns. In this study we describe landforms within Melas Chasma, Valles Marineris...

Chojnacki, Matthew; Fenton, Lori K.; Weintraub, Aaron R; Edgar, Lauren A.; Jodhpurkar, Mohini Jeetendra; Edwards, Christopher S.

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Year Published: 2020

A global shape model for Saturn's moon Enceladus from a dense photogrammetric control network

A planetary bodys global shape provides both insight into its geologic evolution, and a key element of any Planetary Spatial Data Infrastructure (PSDI). NASAs Cassini mission to Saturn acquired more than 600 moderate- to high-resolution images (< 500 m/pixel) of the small, geologically active moon Enceladus. The moons internal global ocean and...

Bland, Michael T.; Weller, Lynn A.; Mayer, David; Archinal, Brent

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Year Published: 2020

Coordination of planetary coordinate system recommendations by the IAU Working Group on Cartographic Coordinates and Rotational Elements–2020 status and future

Our goal is to request input from the lunar and planetary community regarding issues of planetary coordinate systems and cartography standards. We begin with an overview of the work of the International Astronomical Union Working Group on Cartographic Coordinates and Rotational Elements. We briefly describe the operations and membership of the...

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

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Year Published: 2020

Evidence for a diagenetic origin of Vera Rubin Ridge, Gale Crater, Mars: Summary and synthesis of Curiosity's exploration campaign

This paper provides an overview of the Curiosity rover's exploration at Vera Rubin ridge and summarizes the science results. Vera Rubin ridge (VRR) is a distinct geomorphic feature on lower Aeolis Mons (informally known as Mt. Sharp) that was identified in orbital data based on its distinct texture, topographic expression, and association with a...

Fraeman, Abigail A.; Edgar, Lauren A.; Rampe, Elizabeth B.; Thompson, Lucy M.; Frydenvang, Jens; Fedo, Christopher M.; Catalano, Jeff G.; Dietrich, William E.; Gabriel, Travis S. J.; Grotzinger, John P.; L'Haridon, Jonas; Mangold, Nicholas; Sun, Vivian Z.; House, Christopher H; Bryk, Alexander; Hardgrove, Craig; Czarnecki, Sean; Stack, Kathryn M.; Morris, Richard V.; Arvidson, Ray E.; Banham, Steve G.; Bennett, Kristen Alicia; Bridges, Jon C.; Edwards, Christopher S.; Fischer, Woodward W.; Fox, Valerie K.; Gupta, Sanjeev; Horgan, Briony H. N.; Jacob, Sammantha R.; Johnson, Jeffrey R.; Johnson, Sarah S.; Rubin, David R.; Salvatore, Mark R; Schwenzer, Susanne P.; Siebach, Kirsten L.; Stein, Nathan T.; Turner, Stuart; Wellington, Danika F.; Wiens, Roger C.; Williams, Amy J.; Davidson, G.A.; Wong, Gregory M.

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Year Published: 2020

The chemostratigraphy of the Murray formation and role of diagenesis at Vera Rubin ridge in Gale crater, Mars, as observed by the ChemCam instrument

Geochemical results are presented from Curiosity’s exploration of the Vera Rubin ridge (VRR), in addition to the full chemostratigraphy of the predominantly lacustrine mudstone Murray formation up to and including VRR. VRR is a prominent ridge flanking Aeolis Mons (informally Mt. Sharp), the central mound in Gale crater, Mars, and was a key area...

Frydenvang, Jens; Mangold, Nicholas; Wiens, Roger C.; Fraeman, Abigail A.; Edgar, Lauren A.; Fedo, Christopher M.; L'Haridon, Jonas; Bedford, Candice C.; Gupta, Sanjeev; Grotzinger, John P.; Bridges, Jon C.; Clark, Ben C.; Rampe, Elizabeth B.; Gasnaut, Olivier; Maurice, Sylvestre; Gasda, Patrick J.; Lanza, Nina L.; Olilla, Ann M.; Meslin, Pierre-Yves; Payre, Valerie; Calef, Fred J.; Salvatore, Mark R; House, Christopher H

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Year Published: 2020

Conceptual model for the removal of cold-trapped H2O ice on the Mars northern seasonal springtime polar cap

The transport of H2O ice along the retreating north polar seasonal CO2 ice cap has previously been modeled and observed. Spectral observations show that H2O ice forms on the interior of the seasonal cap, while thermal observations show these regions to be consistent with CO2 ice. Prior to the sublimation of the seasonal CO2, the observed...

Titus, Timothy N.; Williams, Kaj; Cushing, Glen E.

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Year Published: 2020

Planetary science decadal survey planetary mission concept study report: Ceres: Exploration of Ceres’ habitability

Dwarf planet Ceres is a compelling target as an evolved ocean world with, at least, regional brine reservoirs and potentially ongoing geological activity. As the most water-rich body in the inner solar system (in relative abundance), it is a representative of the population of planetesimals that brought volatiles and organics to the inner solar...

Titus, Timothy N.; Castillo-Rogez, J. C.; Brody, John; Bland, Michael T.; Buczkowski, Debra; Grimm, Robert; Hendrix, A.; Miller, Kelly; Prettyman, Thomas; Quick, Lynnae; Raymond, Carol; Scully, Jennifer; Sori, Michael M.; Sekine, Yasuhito; Williams, David; Zolensky, Michael

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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