Astrogeology Science Center

Publications

Filter Total Items: 780
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Year Published: 2017

Effects of varying obliquity on Martian sublimation thermokarst landforms

Scalloped depressions in the Martian mid-latitudes are likely formed by sublimation of ice-rich ground. The stability of subsurface ice changes with the planetary obliquity, generally becoming less stable at lower axial tilt. As a result, the relative rates of sublimation and creep change over time. A landscape evolution model shows that these...

Dundas, Colin M.

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Year Published: 2017

Analysis of local slopes at the InSight landing site on Mars

To evaluate the topography of the surface within the InSight candidate landing ellipses, we generated Digital Terrain Models (DTMs) at lander scales and those appropriate for entry, descent, and landing simulations, along with orthoimages of both images in each stereopair, and adirectional slope images. These products were used to assess the...

Fergason, Robin L.; Kirk, Randolph L.; Cushing, Glen E.; Galuszka, Donna M.; Golombek, Matthew P.; Hare, Trent M.; Howington-Kraus, Elpitha; Kipp, Devin M; Redding, Bonnie L.

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Year Published: 2016

Changes in blast zone albedo patterns around new martian impact craters

“Blast zones” (BZs) around new martian craters comprise various albedo features caused by the initial impact, including diffuse halos, extended linear and arcuate rays, secondary craters, ejecta patterns, and dust avalanches. We examined these features for changes in repeat images separated by up to four Mars years. Here we present the first...

Daubar, Ingrid J.; Dundas, Colin M.; Byrne, Shane; Geissler, Paul E.; Bart, Gwen; McEwen, Alfred S.; Russell, Patrick; Chojnacki, Matthew; Golombek, M.P.
I.J. Daubar, C.M. Dundas, S. Byrne, P. Geissler, G.D. Bart, A.S. McEwen, P.S. Russell, M. Chojnacki, and M.P. Golombek, 2016, Changes in blast zone albedo patterns around new martian impact craters: Icarus 267 (2016) 86–105, https://doi.org/10.1016/j.icarus.2015.11.032.

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Year Published: 2016

Orbital monitoring of martian surface changes

A history of martian surface changes is documented by a sequence of global mosaics made up of Mars Global Surveyor Mars Orbiter Camera daily color images from 1999 to 2006, together with a single mosaic from the Mars Reconnaissance Orbiter Mars Color Imager in 2009. These observations show that changes in the global albedo patterns of Mars take...

Geissler, Paul E.; Fenton, L.K.; Enga, M.; Mukherjee, P.
Geissler, P.E., Fenton, L.K., Enga, M., and Mukherjee, P., 2016, Orbital monitoring of martian surface changes: Icarus, v. 278,p. 279-300, https://doi.org/10.1016/j.icarus.2016.05.023.

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Year Published: 2016

Comparing orbiter and rover image-based mapping of an ancient sedimentary environment, Aeolis Palus, Gale crater, Mars

This study provides the first systematic comparison of orbital facies maps with detailed ground-based geology observations from the Mars Science Laboratory (MSL) Curiosity rover to examine the validity of geologic interpretations derived from orbital image data. Orbital facies maps were constructed for the Darwin, Cooperstown, and Kimberley...

Stack, Kathryn M.; Edwards, Christopher; Grotzinger, J. P.; Gupta, S.; Sumner, D.; Edgar, Lauren A.; Fraeman, A.; Jacob, S.; LeDeit, L.; Lewis, K.W.; Rice, M.S.; Rubin, D.; Calef, F.; Edgett, K.; Williams, R.M.E.; Williford, K.H.
K.M. Stack et al., Comparing orbiter and rover image-based mapping of an ancient sedimentary environment, Aeolis Palus, Gale crater, Mars, Icarus (2016), http://dx.doi.org/10.1016/j.icarus.2016.02.024

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Year Published: 2016

Cratering on Ceres: Implications for its crust and evolution

Thermochemical models have predicted that Ceres, is to some extent, differentiated and should have an icy crust with few or no impact craters. We present observations by the Dawn spacecraft that reveal a heavily cratered surface, a heterogeneous crater distribution, and an apparent absence of large craters. The morphology of some impact craters is...

Hiesinger, H.; Marchi, S.; Schmedemann, N.; Schenk, P.; Pasckert, J. H.; Neesemann, A.; O'Brien, D. P.; Kneissl, T.; Ermakov, A.; Fu, R.R.; Bland, M. T.; Nathues, A.; Platz, T.; Williams, D.A.; Jaumann, R.; Castillo-Rogez, J. C.; Ruesch, O.; Schmidt, B.; Park, R.S.; Preusker, F.; Buczkowski, D.L.; Russell, C.T.; Raymond, C.A.

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Year Published: 2016

Response comment: Carbon sequestration on Mars

Martian atmospheric pressure has important implications for the past and present habitability of the planet, including the timing and causes of environmental change. The ancient Martian surface is strewn with evidence for early water bound in minerals (e.g., Ehlmann and Edwards, 2014) and recorded in surface features such as large catastrophically...

Edwards, Christopher; Ehlmann, Bethany L.

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Year Published: 2016

Transformations to granular zircon revealed: Twinning, reidite, and ZrO2 in shocked zircon from Meteor Crater (Arizona, USA)

Granular zircon in impact environments has long been recognized but remains poorly understood due to lack of experimental data to identify mechanisms involved in its genesis. Meteor Crater in Arizona (United States) contains abundant evidence of shock metamorphism, including shocked quartz, the high pressure polymorphs coesite and stishovite,...

Cavosie, Aaron; Timms, Nicholas E.; Erickson, Timmons M.; Hagerty, Justin J.; Hörz, Friedrich

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Year Published: 2016

Cryovolcanism on Ceres

Volcanic edifices are abundant on rocky bodies of the inner solar system. In the cold outer solar system, volcanism can occur on solid bodies with a water-ice shell, but derived cryovolcanic constructs have proved elusive. We report the discovery using Dawn Framing Camera images of a landform on dwarf planet Ceres, which we argue represents a...

Ruesch, O.; Platz, T.; Schenk, P.; McFadden, L.A.; Castillo-Rogez, J. C.; Quick, L. C.; Byrne, S.; Preusker, F.; O'Brien, D. P.; Schmedemann, N.; Williams, D.A.; Li, Jian-Yang; Bland, M. T.; Hiesinger, H.; Kneissl, T.; Neesemann, A.; Schaefer, M.; Pasckert, J. H.; Schmidt, B.E.; Buczkowski, D.L.; Sykes, M. V.; Nathues, A.; Roatsch, T.; Hoffman, M.; Raymond, C.A.; Russell, C.T.
Ruesch, Ottaviano, Platz, Thomas, Schenk, P., McFadden, Lucy, Castillo-Rogez, Julie C, Byrne, S, Preusker, Frank, O'Brien, D., Scmedemann, Nico, Williams, Dave, A, Li, J.-Y., Bland, M.T., Heisinger, H, Hiesinger, H., Kneissl, T., Neesemann, A., Schaefer, M., Pasckert, J.H., Schmidt, B.E., Buczkowski, D.L., Sykes, M.V., Nathues, A., Roatsch, T., Hoffmann, M., Raymond, C.A., and Russell, C.T., 2016, Cryovolcanism on Ceres:

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Year Published: 2016

Detection of water and/or hydroxyl on asteroid (16) Psyche

In order to search for evidence of hydration on M-type asteroid (16) Psyche, we observed this object in the 3 μm spectral region using the long-wavelength cross-dispersed (LXD: 1.9–4.2 μm) mode of the SpeX spectrograph/imager at the NASA Infrared Telescope Facility. Our observations show that Psyche exhibits a 3 μm absorption...

Takir, Driss; Reddy, Vishnu; Sanchez, Juan A.; Shepard, Michael K.; Emery, Joshua P.
Takir D, Reddy V, Sanchez JA, Shepard MK, Emery JP (2017) Detection of water and/or hydroxyl on asteroid (16) Psyche. Astron J 153:31.

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Year Published: 2016

Special section introduction on MicroMars to MegaMars

The study of Earth's surface and atmosphere evolved from local investigations to the incorporation of remote sensing on a global scale. The study of Mars has followed the opposite progression, beginning with telescopic observations, followed by flyby and orbital missions, landers, and finally rover missions in the last ∼20 years. This varied fleet...

Bridges, Nathan T.; Dundas, Colin M.; Edgar, Lauren A.

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Year Published: 2016

The geomorphology of Ceres

Analysis of Dawn spacecraft Framing Camera image data allows evaluation of the topography and geomorphology of features on the surface of Ceres. The dwarf planet is dominated by numerous craters, but other features are also common. Linear structures include both those associated with impact craters and those that do not appear to have any...

Buczkowski, D.L.; Schmidt, B.E.; Williams, D.A.; Mest, S.C.; Scully, J.E.C.; Ermakov, A.; Preusker, F.; Schenk, P.; Otto, K. A.; Hiesinger, H.; O'Brien, D.; Marchi, S.; Sizemore, H.G.; Hughson, K.; Chilton, H.; Bland, M.; Byrne, S.; Schorghofer, N.; Platz, T.; Jaumann, R.; Roatsch, T.; Sykes, M. V.; Nathues, A.; De Sanctis, M.C.; Raymond, C.A.; Russell, C.T.