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10 results on '"Howington-Kraus, Elpitha"'

1. Topography and geomorphology of the Huygens landing site on Titan

Author

Soderblom, Laurence A., Tomasko, Martin G., Archinal, Brent A., Becker, Tammy L., Bushroe, Michael W., Cook, Debbie A., Doose, Lyn R., Galuszka, Donna M., Hare, Trent M., Howington-Kraus, Elpitha, Karkoschka, Erich, Kirk, Randolph L., Lunine, Jonathan I., McFarlane, Elisabeth A., Redding, Bonnie L., Rizk, Bashar, Rosiek, Mark R., See, Charles, and Smith, Peter H.

Published
2007
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2. Comparison of USGS and DLR topographic models of Comet Borrelly and photometric applications

Author

Kirk, Randolph L., Howington-Kraus, Elpitha, Soderblom, Laurence A., Giese, Bernd, and Oberst, Jurgen

Subjects
Comets, Astronomy, Earth sciences
Abstract

Stereo analysis of images obtained during the 2001 flyby of Comet Borrelly by NASA's Deep Space 1 (DS1) probe allows us to quantify the shape and photometric behavior of the nucleus. The shape is complex, with planar facets corresponding to the dark, mottled regions of the surface whereas the bright, smooth regions are convexly curved. The photometric as well as textural differences between these regions can be explained in terms of topography (roughness) at and below the image resolution, without invoking significant variations in single-particle properties; the material on Borrelly's surface could be quite uniform. A statistical comparison of the digital elevation models (DEMs) produced from the three highest-resolution images independently at the USGS and DLR shows that their difference standard deviation is 120 m, consistent with a matching error of 0.20 pixel (similar to reported matching accuracies for many other stereo datasets). The DEMs also show some systematic differences attributable to manual versus automatic matching. Disk-resolved photometric modeling of the nucleus using the DEM shows that bright, smooth terrains on Borrelly are similar in roughness (Hapke roughness [theta] = 20[degrees]) to C-type asteroid Mathilde but slightly brighter and more backscattering (single-scattering albedo w = 0.056, Henyey-Greeustein phase parameter g = -0.32). The dark, mottled terrain is photometrically consistent with the same particles but with roughnesses as large as 60[degrees]. Intrinsically darker material is inconsistent with the phase behavior of these regions. Many local radiance variations are clearly related to topography, and others are consistent with a topographic explanation; one need not invoke albedo variations greater than a few tens of percent to explain the appearance of Borrelly. Published by Elsevier Inc. Keywords: Borrelly; Small bodies; Topography: Photogrammetry; Photometry

Published
2004

3. Overview of the Microscopic Imager Investigation during Spirit's first 450 sols in Gusev crater

Author

Herkenhoff, Ken E., Squyres, Steve W., Anderson, Robert, Archinal, Brent A., Arvidson, Raymond E., Barrett, Janet M., Becker, Kris J., Bell, James F., Budney, Charles, Cabrol, Nathalie A., Chapman, Mary G., Cook, Debbie, Ehlmann, Bethany L., Farmer, Jack, Franklin, Brenda, Gaddis, Lisa R., Galuszka, Donna M., Garcia, Patricia A., Hare, Trent M., Howington-Kraus, Elpitha, Johnson, Jeffrey R., Johnson, Sarah, Kinch, Kjartan, Kirk, Randolph L., Lee, Ella Mae, Leff, Craig, Lemmon, Mark, Madsen, Morten B., Maki, Justin N., Mullins, Kevin F., Redding, Bonnie L., Richter, Lutz, Rosiek, Mark R., Sims, Michael H., Soderblom, Laurence A., Spanovich, Nicole, Springer, Richard, Sucharski, Robert M., Sucharski, Tracie, Sullivan, Rob, Torson, James M., and Yen, Albert

Abstract

The Microscopic Imager (MI) on the Mars Exploration Rover Spirit has returned images of Mars with higher resolution than any previous camera system, allowing detailed petrographic and sedimentological studies of the rocks and soils at the Gusev landing site. Designed to simulate a geologist's hand lens, the MI is mounted on Spirit's instrument arm and can resolve objects 0.1 mm in size or larger. This paper provides an overview of MI operations, data calibration, processing, and analysis of MI data returned during the first 450 sols (Mars days) of the Spirit landed mission. The primary goal of this paper is to facilitate further analyses of MI data by summarizing the methods used to acquire and process the data, the radiometric and geometric accuracy of MI data products, and the availability of archival products. In addition, scientific results of the MI investigation are summarized. MI observations show that poorly sorted soils are common in Gusev crater, although aeolian bedforms have well-sorted coarse sand grains on their surfaces. Abraded surfaces of plains rocks show igneous textures, light-toned veins or fracture-filling minerals, and discrete coatings. The rocks in the Columbia Hills have a wide variety of granular textures, consistent with volcaniclastic or impact origins. Case hardening and submillimeter veins observed in the rocks as well as soil crusts and cemented clods imply episodic subsurface aqueous fluid movement, which has altered multiple geologic units in the Columbia Hills. The MI also monitored Spirit's solar panels and the magnets on the rover's deck.

Published
2006

5. Surface processes recorded by rocks and soils on Meridiani Planum, Mars: Microscopic Imager observations during Opportunity's first three extended missions

Author

Herkenhoff, Ken E., primary, Grotzinger, John, additional, Knoll, Andrew H., additional, McLennan, Scott M., additional, Weitz, Catherine, additional, Yingst, Aileen, additional, Anderson, Robert, additional, Archinal, Brent A., additional, Arvidson, Raymond E., additional, Barrett, Janet M., additional, Becker, Kris J., additional, Bell, James F., additional, Budney, Charles, additional, Chapman, Mary G., additional, Cook, Debbie, additional, Ehlmann, Bethany, additional, Franklin, Brenda, additional, Gaddis, Lisa R., additional, Galuszka, Donna M., additional, Garcia, Patricia A., additional, Geissler, Paul, additional, Hare, Trent M., additional, Howington-Kraus, Elpitha, additional, Johnson, Jeffrey R., additional, Keszthelyi, Laszlo, additional, Kirk, Randolph L., additional, Lanagan, Peter, additional, Lee, Ella Mae, additional, Leff, Craig, additional, Maki, Justin N., additional, Mullins, Kevin F., additional, Parker, Timothy J., additional, Redding, Bonnie L., additional, Rosiek, Mark R., additional, Sims, Michael H., additional, Soderblom, Laurence A., additional, Spanovich, Nicole, additional, Springer, Richard, additional, Squyres, Steve W., additional, Stolper, Daniel, additional, Sucharski, Robert M., additional, Sucharski, Tracie, additional, Sullivan, Rob, additional, and Torson, James M., additional

Published
2008
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6. Overview of the Microscopic Imager Investigation during Spirit's first 450 sols in Gusev crater

Author

Herkenhoff, Ken E., primary, Squyres, Steve W., additional, Anderson, Robert, additional, Archinal, Brent A., additional, Arvidson, Raymond E., additional, Barrett, Janet M., additional, Becker, Kris J., additional, Bell, James F., additional, Budney, Charles, additional, Cabrol, Nathalie A., additional, Chapman, Mary G., additional, Cook, Debbie, additional, Ehlmann, Bethany L., additional, Farmer, Jack, additional, Franklin, Brenda, additional, Gaddis, Lisa R., additional, Galuszka, Donna M., additional, Garcia, Patricia A., additional, Hare, Trent M., additional, Howington-Kraus, Elpitha, additional, Johnson, Jeffrey R., additional, Johnson, Sarah, additional, Kinch, Kjartan, additional, Kirk, Randolph L., additional, Lee, Ella Mae, additional, Leff, Craig, additional, Lemmon, Mark, additional, Madsen, Morten B., additional, Maki, Justin N., additional, Mullins, Kevin F., additional, Redding, Bonnie L., additional, Richter, Lutz, additional, Rosiek, Mark R., additional, Sims, Michael H., additional, Soderblom, Laurence A., additional, Spanovich, Nicole, additional, Springer, Richard, additional, Sucharski, Robert M., additional, Sucharski, Tracie, additional, Sullivan, Rob, additional, Torson, James M., additional, and Yen, Albert, additional

Published
2006
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7. HRSC on Mars Express – Photogrammetric and Cartographic Research

Author

Albertz, Joerg, primary, Attwenger, Maria, additional, Barrett, Janet, additional, Casley, Simon, additional, Dorninger, Peter, additional, Dorrer, Egon, additional, Ebner, Heinrich, additional, Gehrke, Stephan, additional, Giese, Bernd, additional, Gwinner, Klaus, additional, Heipke, Christian, additional, Howington-Kraus, Elpitha, additional, Kirk, Randolph L., additional, Lehmann, Hartmut, additional, Mayer, Helmut, additional, Muller, Jan-Peter, additional, Oberst, Juergen, additional, Ostrovskiy, Alexey, additional, Renter, Joerg, additional, Reznik, Sergiy, additional, Schmidt, Ralph, additional, Scholten, Frank, additional, Spiegel, Michael, additional, Stilla, Uwe, additional, Wählisch, Marita, additional, and Neukum, Gerhard, additional

Published
2005
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8. Mapping Mars at Global to Human Scales

Author

Archinal, Brent A., primary, Kirk, Randolph L., additional, Howington-Kraus, Elpitha, additional, Rosiek, Mark R., additional, Soderblom, Laurence A., additional, and Lee, Ella M., additional

Published
2005
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10. Surface Processes Recorded by Rocks and Soils on Meridiani Planum, Mars: Microscopic Imager Observations During Opportunity's First Three Extended Missions

Author

Knoll, Andrew, Torson, James M., Sullivan, Rob, Sucharski, Tracie, Sucharski, Robert M., Stolper, Daniel, Squyres, Steve W., Springer, Richard, Spanovich, Nicole, Soderblom, Laurence A., Sims, MIchael H., Rosiek, Mark R., Redding, Bonnie L., Parker, Timothy J., Mullins, Kevin F., Maki, Justin N., Leff, Craig, Lee, Ella Mae, Lanagan, Peter, Kirk, Randolph L., Keszthelyi, Laszlo, Johnson, Jeffrey R., Howington-Kraus, Elpitha, Hare, Trent M., Geissler, Paul, Garcia, Patricia A., Galuszka, Donna M., Gaddis, Lisa R., Franklin, Brenda, Ehlmann, Bethany, Cook, Debbie, Chapman, Mary G., Budney, Charles, Bell, James F. III, Becker, Kris J., Barrett, Janet M., Arvidson, Raymond E., Archinal, Brent A., Anderson, Robert, Yingst, Aileen, Weitz, Catherine, McLennan, Scott M., Grotzinger, John P., and Herkenhoff, Ken E.

Abstract

The Microscopic Imager (MI) on the Mars Exploration Rover Opportunity has returned images of Mars with higher resolution than any previous camera system, allowing detailed petrographic and sedimentological studies of the rocks and soils at the Meridiani Planum landing site. Designed to simulate a geologist's hand lens, the MI is mounted on Opportunity's instrument arm and can resolve objects 0.1 mm across or larger. This paper provides an overview of MI operations, data calibration, and analysis of MI data returned during the first 900 sols (Mars days) of the Opportunity landed mission. Analyses of Opportunity MI data have helped to resolve major questions about the origin of observed textures and features. These studies support eolian sediment transport, rather than impact surge processes, as the dominant depositional mechanism for Burns formation strata. MI stereo observations of a rock outcrop near the rim of Erebus Crater support the previous interpretation of similar sedimentary structures in Eagle Crater as being formed by surficial flow of liquid water. Well-sorted spherules dominate ripple surfaces on the Meridiani plains, and the size of spherules between ripples decreases by about 1 mm from north to south along Opportunity's traverse between Endurance and Erebus craters., Organismic and Evolutionary Biology

Published
2008
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