Astrogeology Science Center

Publications

Filter Total Items: 771
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Year Published: 2017

Pitted terrains on (1) Ceres and implications for shallow subsurface volatile distribution

Prior to the arrival of the Dawn spacecraft at Ceres, the dwarf planet was anticipated to be ice-rich. Searches for morphological features related to ice have been ongoing during Dawn's mission at Ceres. Here we report the identification of pitted terrains associated with fresh Cerean impact craters. The Cerean pitted terrains exhibit strong...

Sizemore, H.G.; Platz, Thomas; Schorghofer, Norbert; Prettyman, Thomas; De Sanctis, Maria Christina; Crown, David A.; Schmedemann, Nico; Nessemann, Andeas; Kneissl, Thomas; Simone Marchi; Schenk, Paul M.; Bland, Michael T.; Schmidt, B.E.; Hughson, Kynan H.G.; Tosi, F.; Zambon, F; Mest, S.C.; Yingst, R.A.; Williams, D.A.; Russell, C.T.; Raymond, C.A.
Sizemore, H. G., et al. (2017), Pitted terrains on (1) Ceres and implications for shallow subsurface volatile distribution, Geophys. Res. Lett., 44, 6570-6578, doi:10.1002/2017GL073970

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Year Published: 2017

Selection of the InSight landing site

The selection of the Discovery Program InSight landing site took over four years from initial identification of possible areas that met engineering constraints, to downselection via targeted data from orbiters (especially Mars Reconnaissance Orbiter (MRO) Context Camera (CTX) and High-Resolution Imaging Science Experiment (HiRISE) images), to...

Golombek, M.; Kipp, D.; Warner, N.; Daubar, Ingrid J.; Fergason, Robin L.; Kirk, Randolph L.; Beyer, R.; Huertas, A.; Piqueux, Sylvain; Putzig, N.E.; Campbell, B.A.; Morgan, G. A.; Charalambous, C.; Pike, W. T.; Gwinner, K.; Calef, F.; Kass, D.; Mischna, M. A.; Ashley, J.; Bloom, C.; Wigton, N.; Hare, T.; Schwartz, C.; Gengl, H.; Redmond, L.; Trautman, M.; Sweeney, J.; Grima, C.; Smith, I. B.; Sklyanskiy, E.; Lisano, M.; Benardini, J.; Smrekar, S.E.; Lognonne, P.; Banerdt, W. B.

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Year Published: 2017

The Mars Science Laboratory Curiosity rover Mastcam instruments: Preflight and in-flight calibration, validation, and data archiving

The NASA Curiosity rover Mast Camera (Mastcam) system is a pair of fixed-focal length, multispectral, color CCD imagers mounted ~2 m above the surface on the rover's remote sensing mast, along with associated electronics and an onboard calibration target. The left Mastcam (M-34) has a 34 mm focal length, an instantaneous field of view (...

Bell, James F. ; Godber, A.; McNair, S.; Caplinger, M.A.; Maki, J.N.; Lemmon, M.T.; Van Beek, J.; Malin, M.C.; Wellington, D.; Kinch, K.M.; Madsen, M.B.; Hardgrove, C.; Ravine, M.A.; Jensen, E.; Harker, D.; Anderson, Ryan; Herkenhoff, Kenneth E.; Morris, R.V.; Cisneros, E.; Deen, R.G.

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Year Published: 2017

Viscous relaxation of Ganymede's impact craters: Constraints on heat flux

Measurement of crater depths in Ganymede’s dark terrain have revealed substantial numbers of unusually shallow craters indicative of viscous relaxation [see companion paper: Singer, K.N., Schenk, P. M., Bland, M.T., McKinnon, W.B., (2017). Relaxed impact craters on Ganymede: Regional variations and high heat flow. Icarus, submitted]. These...

Bland, Michael T.; Singer, Kelsi N.; McKinnon, William B.; Schenk, Paul M.
Bland, M. T. and McKinnon, W. B. Viscous relaxation of Ganymede's impact craters: Constraints on heat flux. Icarus 296, 275-288.

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Year Published: 2017

In situ detection of boron by ChemCam on Mars

We report the first in situ detection of boron on Mars. Boron has been detected in Gale crater at levels <0.05 wt % B by the NASA Curiosity rover ChemCam instrument in calcium‐sulfate‐filled fractures, which formed in a late‐stage groundwater circulating mainly in phyllosilicate‐rich bedrock interpreted as lacustrine in origin. We...

Gasda, Patrick J.; Haldeman, Ethan B.; Wiens, Roger C.; Rapin, William; Bristow, Thomas F.; Bridges, John C.; Schwenzer, Susanne P.; Clark, Benton C.; Herkenhoff, Kenneth E.; Frydenvang, Jens; Lanza, Nina L.; Maurice, Sylvestre; Clegg, Samuel M.; Delapp, Dorothea M.; Sanford, Veronica L.; Bodine, Madeleine R.; McInroy, Rhonda
Gasda, P. J., E. B. Haldeman, R. C. Wiens, W. Rapin, T. F. Bristow, J. C. Bridges, S. P. Schwenzer, B. Clark, K. Herkenhoff, J. Frydenvang, N. L. Lanza, S. Maurice, S. Clegg, D. M. Delapp, V. L. Sanford, M. R. Bodine, and R. McInroy (2017), In situ detection of boron by ChemCam on Mars, Geophys. Res. Lett., doi: 10.1002/2017GL074480.

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Year Published: 2017

The planetary data system

In the early 1980s, the Space Science Board (SSB) of the National Research Council was concerned about the poor and inconsistent treatment of scientific information returned from NASA’s space science missions. The SSB formed a panel [The Committee on Data Management and Computation (CODMAC)] to assess the situation and make recommendations to NASA...

Acton, Charles; Slavney, Susan; Arvidson, Raymond E.; Gaddis, Lisa R.; Gordon, Mitchell; Lavoie, Susan
Acton, C., Slavney, S., Arvidson, R., Gaddis, L., Gordon, M. and Lavoie, Susan, 2017, The Planetary Data System, Lunar and Planetary Information Bulletin, Issue 150, Sept. 2017, pp. 2-12.

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Year Published: 2017

An evaluation of sampling and full enumeration strategies for Fisher Jenks classification in big data settings

Large data contexts present a number of challenges to optimal choropleth map classifiers. Application of optimal classifiers to a sample of the attribute space is one proposed solution. The properties of alternative sampling-based classification methods are examined through a series of Monte Carlo simulations. The impacts of spatial...

Rey, Sergio J.; Stephens, Philip A.; Laura, Jason R.
Rey SJ, Stephens P, Laura J. An evaluation of sampling and full enumeration strategies for Fisher Jenks classification in big data settings. Transactions in GIS. 2017;21:796–810. https://doi.org/10.1111/tgis.12236

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Year Published: 2017

The U.S. Geological Survey Astrogeology Science Center

In 1960, Eugene Shoemaker and a small team of other scientists founded the field of astrogeology to develop tools and methods for astronauts studying the geology of the Moon and other planetary bodies. Subsequently, in 1962, the U.S. Geological Survey Branch of Astrogeology was established in Menlo Park, California. In 1963, the Branch moved to...

Kestay, Laszlo P.; Vaughan, R. Greg; Gaddis, Lisa R.; Herkenhoff, Kenneth E.; Hagerty, Justin J.

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Year Published: 2017

Geomorphology of comet 67P/Churyumov–Gerasimenko

We present a global geomorphological map of comet 67P/Churyumov–Gerasimenko (67P/C-G) using data acquired by the Rosetta Orbiter’s OSIRIS Narrow Angle Camera. The images used in our study were acquired between 2014 August and 2015 May, before 67P/C-G passed through perihelion. Imagery of the Southern hemisphere was included in our study...

Birch, Samuel P. D.; Tang, Y.; Hayes, A. G.; Kirk, Randolph L.; Bodewitz, D.; Campins, H.; Fernandez, Y.; de Freitas Bart, R.; Kutsop, N. W.; Sierks, H.; Soderblom, J. M.; Squyres, S. W.; Vincent, J.-B.
Birch, S.P.D., Tang, Y., Hayes, A.G., Kirk, R.L., Bodewits, D., Campins, H., Fernandez, Y., de Freitas, B.R., Kutsop, N.W., Sierks, H., Soderblom, J.M., Squyres, S.W., and Vincent, J-B., 2017, Geomorphology of comet 67P/Churyumov--Gerasimenko: Monthly Notices of the Royal Astronomical Society, p. S50-S67, https://doi.org/10.1093/mnras/stx1096.

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Year Published: 2017

The morphology of transverse aeolian ridges on Mars

A preliminary survey of publicly released high resolution digital terrain models (DTMs) produced by the High Resolution Imaging Science Experiment (HiRISE) camera on Mars Reconnaissance Orbiter identified transverse aeolian ridges (TARs) in 154 DTMs in latitudes from 50°S to 40°N. Consistent with previous surveys, the TARs identified in HiRISE...

Geissler, Paul; Wilgus, Justin T.
Paul E. Geissler and Justin T. Wilgus, 2017, The morphology of transverse aeolian ridges on Mars, Aeolian Research, v. 26, p. 63-71, https://doi.org/10.1016/j.aeolia.2016.08.008.

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Year Published: 2017

Geomorphological evidence for ground ice on dwarf planet Ceres

Five decades of observations of Ceres suggest that the dwarf planet has a composition similar to carbonaceous meteorites and may have an ice-rich outer shell protected by a silicate layer. NASA’s Dawn spacecraft has detected ubiquitous clays, carbonates and other products of aqueous alteration across the surface of Ceres, but surprisingly it has...

Schmidt, Britney E.; Hughson, Kynan H.G.; Chilton, Heather T.; Scully, Jennifer E. C.; Platz, Thomas; Nathues, Andreas; Sizemore, Hanna; Bland, Michael T.; Byrne, Shane; Marchi, Simone; O'Brien, David; Schorghofer, Norbert; Hiesinger, Harald; Jaumann, Ralf; Hendrick Pasckert, Jan; Lawrence, Justin D.; Buzckowski, Debra; Castillo-Rogez, Julie C.; Sykes, Mark V.; Schenk, Paul M.; DeSanctis, Maria-Cristina; Mitri, Giuseppe; Formisano, Michelangelo; Li, Jian-Yang; Reddy, Vishnu; Le Corre, Lucille; Russell, Christopher T.; Raymond, Carol A.

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Year Published: 2017

Bedrock and structural geologic maps of eastern Candor Sulci, western Ceti Mensa, and southeastern Ceti Mensa, Candor Chasma, Valles Marineris region of Mars

This map product contains a set of three 1:18,000-scale maps showing the geology and structure of study areas in the western Candor Chasma region of Valles Marineris, Mars. These maps are part of an informal series of large-scale maps and map-based topical studies aimed at refining current understanding of the geologic history of western Candor...

Okubo, Chris H.; Gaither, Tenielle A.
Okubo, C.H., and Gaither, T.A., 2017, Bedrock and structural geologic maps of eastern Candor Sulci, western Ceti Mensa, and southeastern Ceti Mensa, Candor Chasma, Valles Marineris region of Mars: U.S. Geological Survey Scientific Investigations Map 3359, pamphlet 12 p., scale 1:18,000, https://doi.org/10.3133/sim3359.