Kenneth Edward Herkenhoff, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 149
Meteorites on Mars observed with Mars Exploration Rovers
Reduced weathering rates due to the lack of liquid water and significantly greater typical surface ages should result in a higher density of meteorites on the surface of Mars compared to Earth. Several meteorites were identified among the rocks investigated during Opportunity's traverse across the sandy Meridiani plains. Heat Shield Rock is a IAB iron meteorite and has been officially recognized a
Authors
C. Schroder, D.S. Rodionov, T.J. McCoy, B.L. Jolliff, Ralf Gellert, L.R. Nittler, W. H. Farrand, J. R. Johnson, S. W. Ruff, James W. Ashley, D. W. Mittlefehldt, Kenneth E. Herkenhoff, I. Fleischer, A. F. C. Haldemann, G. Klingelhofer, D. W. Ming, R.V. Morris, P.A. de Souza, S. W. Squyres, C. Weitz, A. S. Yen, J. Zipfel, T. Economou
Soil sedimentology at Gusev Crater from Columbia Memorial Station to Winter Haven
A total of 3140 individual particles were examined in 31 soils along Spirit's traverse. Their size, shape, and texture were quantified and classified. They represent a unique record of 3 years of sedimentologic exploration from landing to sol 1085 covering the Plains Unit to Winter Haven where Spirit spent the Martian winter of 2006. Samples in the Plains Unit and Columbia Hills appear as reflecti
Authors
N.A. Cabrol, Kenneth E. Herkenhoff, R. Greeley, E.A. Grin, C. Schroder, C. d'Uston, C. Weitz, R.A. Yingst, B. A. Cohen, Jeff Moore, A. Knudson, B. Franklin, R. C. Anderson, R. Li
North polar region of Mars: Advances in stratigraphy, structure, and erosional modification
We have remapped the geology of the north polar plateau on Mars, Planum Boreum, and the surrounding plains of Vastitas Borealis using altimetry and image data along with thematic maps resulting from observations made by the Mars Global Surveyor, Mars Odyssey, Mars Express, and Mars Reconnaissance Orbiter spacecraft. New and revised geographic and geologic terminologies assist with effectively disc
Authors
Kenneth L. Tanaka, J. Alexis P. Rodriguez, James A. Skinner, Mary C. Bourke, Corey M. Fortezzo, Kenneth E. Herkenhoff, Eric J. Kolb, Chris Okubo
Columbia Hills, Mars: aeolian features seen from the ground and orbit
Abundant wind-related features occur along Spirit's traverse into the Columbia Hills over the basaltic plains of Gusev Crater. Most of the windblown sands are probably derived from weathering of rocks within the crater, and possibly from deposits associated with Ma'adim Vallis. Windblown particles act as agents of abrasion, forming ventifacts, and are organized in places into various bed forms. Wi
Authors
Ronald Greeley, Patrick L. Whelley, Lynn D.V. Neakrase, Raymond E. Arvidson, Nathan T. Bridges, Nathalie A. Cabrol, Phillip R. Christensen, Kaichang Di, Daniel J. Foley, Matthew P. Golombek, Kenneth E. Herkenhoff, Amy Knudson, Ruslan O. Kuzmin, Ron Li, Timothy Michaels, Steven W. Squyres, Robert Sullivan, Shane D. Thompson
Light-toned salty soils and co-existing Si-rich species discovered by the Mars Exploration Rover Spirit in Columbia Hills
Light-toned soils were exposed, through serendipitous excavations by Spirit Rover wheels, at eight locations in the Columbia Hills. Their occurrences were grouped into four types on the basis of geomorphic settings. At three major exposures, the light-toned soils are hydrous and sulfate-rich. The spatial distributions of distinct types of salty soils vary substantially: with centimeter-scaled hete
Authors
Alian Wang, J.F. Bell, Ron Li, J. R. Johnson, W. H. Farrand, E.A. Cloutis, R. E. Arvidson, L. Crumpler, S. W. Squyres, S. M. McLennan, Kenneth E. Herkenhoff, S. W. Ruff, A.T. Knudson, Wei Chen, R. Greenberger
High Resolution Imaging Science Experiment (HiRISE) observations of glacial and periglacial morphologies in the circum-Argyre Planitia highlands, Mars
The landscape of the Argyre Planitia and adjoining Charitum and Nereidum Montes in the southern hemisphere of Mars has been heavily modified since formation of the Argyre impact basin. This study examines morphologies in the Argyre region revealed in images acquired by the High Resolution Imaging Science Experiment (HiRISE) camera and discusses the implications for glacial and periglacial processe
Authors
Maria E. Banks, Alfred S. McEwen, Jeffrey S. Kargel, Victor R. Baker, Robert G. Strom, Michael T. Mellon, Virginia C. Gulick, Laszlo P. Keszthelyi, Kenneth E. Herkenhoff, Jon D. Pelletier, Windy L. Jaeger
Hematite spherules at Meridiani: results from MI, Mini-TES, and Pancam
We report on observations of hematite‐bearing spherules at Meridiani Planum made using the Microscopic Imager (MI), Mini‐Thermal Emission Spectrometer (Mini‐TES), and Panoramic Camera (Pancam) instruments on the Mars Exploration Rover Opportunity. Spherules were observed on soil surfaces and in outcrop rocks, both on undisturbed surfaces and in abraded surfaces ground using the Rock Abrasion Tool
Authors
W. M. Calvin, J.D. Shoffner, J. R. Johnson, A.H. Knoll, J.M. Pocock, S. W. Squyres, C.M. Weitz, R. E. Arvidson, J.F. Bell, P. R. Christensen, P. A. de Souza, W. H. Farrand, T.D. Glotch, Kenneth E. Herkenhoff, B.L. Jolliff, A.T. Knudson, S. M. McLennan, A.D. Rogers, S.D. Thompson
Seasonally active frost-dust avalanches on a north polar scarp of Mars captured by HiRISE
North-polar temporal monitoring by the High Resolution Imaging Science Experiment (HiRISE) orbiting Mars has discovered new, dramatic examples that Mars1 CO2-dominated seasonal volatile cycle is not limited to quiet deposition and sublimation of frost. In early northern martian spring, 2008, HiRISE captured several cases of CO2 frost and dust cascading down a steep, polar scarp in discrete clouds.
Authors
Patrick S. Russell, Nicolas Thomas, Shane Byrne, Kenneth E. Herkenhoff, Kathryn E. Fishbaugh, Nathan Bridges, Chris Okubo, Moses P. Milazzo, Ingrid J. Daubar, Candice J. Hansen, Alfred S. McEwen
Wind-driven particle mobility on Mars: Insights from Mars Exploration Rover observations at "El Dorado" and surroundings at Gusev Crater
The ripple field known as 'El Dorado' was a unique stop on Spirit's traverse where dust-raising, active mafic sand ripples and larger inactive coarse-grained ripples interact, illuminating several long-standing issues of Martian dust mobility, sand mobility, and the origin of transverse aeolian ridges. Strong regional wind events endured by Spirit caused perceptible migration of ripple crests in d
Authors
R. Sullivan, R. Arvidson, J.F. Bell, Ralf Gellert, M. Golombek, R. Greeley, Kenneth E. Herkenhoff, J. Johnson, S. Thompson, P. Whelley, J. Wray
Windy Mars: A dynamic planet as seen by the HiRISE camera
With a dynamic atmosphere and a large supply of particulate material, the surface of Mars is heavily influenced by wind-driven, or aeolian, processes. The High Resolution Imaging Science Experiment (HiRISE) camera on the Mars Reconnaissance Orbiter (MRO) provides a new view of Martian geology, with the ability to see decimeter-size features. Current sand movement, and evidence for recent bedform d
Authors
Nathan T. Bridges, Paul E. Geissler, Alfred S. McEwen, B.J. Thomson, Frank C. Chuang, Kenneth E. Herkenhoff, Laszlo P. Keszthelyi, Sara Martinez-Alonso
Mars reconnaissance orbiter's high resolution imaging science experiment (HiRISE)
The HiRISE camera features a 0.5 m diameter primary mirror, 12 m effective focal length, and a focal plane system that can acquire images containing up to 28 Gb (gigabits) of data in as little as 6 seconds. HiRISE will provide detailed images (0.25 to 1.3 m/pixel) covering ∼1% of the Martian surface during the 2‐year Primary Science Phase (PSP) beginning November 2006. Most images will include col
Authors
Alfred S. McEwen, Eric M. Eliason, James W. Bergstrom, Nathan T. Bridges, Candice J. Hansen, W. Alan Delamere, John A. Grant, Virginia C. Gulick, Kenneth E. Herkenhoff, Laszlo P. Keszthelyi, Randolph L. Kirk, Michael T. Mellon, Steven W. Squyres, Nicolas Thomas, Catherine M. Weitz
Evidence for montmorillonite or its compositional equivalent in Columbia Hills, Mars
During its exploration of the Columbia Hills, the Mars Exploration Rover "Spirit" encountered several similar samples that are distinctly different from Martian meteorites and known Gusev crater soils, rocks, and sediments. Occurring in a variety of contexts and locations, these "Independence class" samples are rough-textured, iron-poor (equivalent FeO ??? 4 wt%), have high Al/Si ratios, and often
Authors
B. C. Clark, R. E. Arvidson, Ralf Gellert, R.V. Morris, D. W. Ming, L. Richter, S. W. Ruff, J.R. Michalski, W. H. Farrand, A. S. Yen, Kenneth E. Herkenhoff, R. Li, S. W. Squyres, C. Schroder, G. Klingelhofer, J.F. Bell
Science and Products
Filter Total Items: 149
Meteorites on Mars observed with Mars Exploration Rovers
Reduced weathering rates due to the lack of liquid water and significantly greater typical surface ages should result in a higher density of meteorites on the surface of Mars compared to Earth. Several meteorites were identified among the rocks investigated during Opportunity's traverse across the sandy Meridiani plains. Heat Shield Rock is a IAB iron meteorite and has been officially recognized a
Authors
C. Schroder, D.S. Rodionov, T.J. McCoy, B.L. Jolliff, Ralf Gellert, L.R. Nittler, W. H. Farrand, J. R. Johnson, S. W. Ruff, James W. Ashley, D. W. Mittlefehldt, Kenneth E. Herkenhoff, I. Fleischer, A. F. C. Haldemann, G. Klingelhofer, D. W. Ming, R.V. Morris, P.A. de Souza, S. W. Squyres, C. Weitz, A. S. Yen, J. Zipfel, T. Economou
Soil sedimentology at Gusev Crater from Columbia Memorial Station to Winter Haven
A total of 3140 individual particles were examined in 31 soils along Spirit's traverse. Their size, shape, and texture were quantified and classified. They represent a unique record of 3 years of sedimentologic exploration from landing to sol 1085 covering the Plains Unit to Winter Haven where Spirit spent the Martian winter of 2006. Samples in the Plains Unit and Columbia Hills appear as reflecti
Authors
N.A. Cabrol, Kenneth E. Herkenhoff, R. Greeley, E.A. Grin, C. Schroder, C. d'Uston, C. Weitz, R.A. Yingst, B. A. Cohen, Jeff Moore, A. Knudson, B. Franklin, R. C. Anderson, R. Li
North polar region of Mars: Advances in stratigraphy, structure, and erosional modification
We have remapped the geology of the north polar plateau on Mars, Planum Boreum, and the surrounding plains of Vastitas Borealis using altimetry and image data along with thematic maps resulting from observations made by the Mars Global Surveyor, Mars Odyssey, Mars Express, and Mars Reconnaissance Orbiter spacecraft. New and revised geographic and geologic terminologies assist with effectively disc
Authors
Kenneth L. Tanaka, J. Alexis P. Rodriguez, James A. Skinner, Mary C. Bourke, Corey M. Fortezzo, Kenneth E. Herkenhoff, Eric J. Kolb, Chris Okubo
Columbia Hills, Mars: aeolian features seen from the ground and orbit
Abundant wind-related features occur along Spirit's traverse into the Columbia Hills over the basaltic plains of Gusev Crater. Most of the windblown sands are probably derived from weathering of rocks within the crater, and possibly from deposits associated with Ma'adim Vallis. Windblown particles act as agents of abrasion, forming ventifacts, and are organized in places into various bed forms. Wi
Authors
Ronald Greeley, Patrick L. Whelley, Lynn D.V. Neakrase, Raymond E. Arvidson, Nathan T. Bridges, Nathalie A. Cabrol, Phillip R. Christensen, Kaichang Di, Daniel J. Foley, Matthew P. Golombek, Kenneth E. Herkenhoff, Amy Knudson, Ruslan O. Kuzmin, Ron Li, Timothy Michaels, Steven W. Squyres, Robert Sullivan, Shane D. Thompson
Light-toned salty soils and co-existing Si-rich species discovered by the Mars Exploration Rover Spirit in Columbia Hills
Light-toned soils were exposed, through serendipitous excavations by Spirit Rover wheels, at eight locations in the Columbia Hills. Their occurrences were grouped into four types on the basis of geomorphic settings. At three major exposures, the light-toned soils are hydrous and sulfate-rich. The spatial distributions of distinct types of salty soils vary substantially: with centimeter-scaled hete
Authors
Alian Wang, J.F. Bell, Ron Li, J. R. Johnson, W. H. Farrand, E.A. Cloutis, R. E. Arvidson, L. Crumpler, S. W. Squyres, S. M. McLennan, Kenneth E. Herkenhoff, S. W. Ruff, A.T. Knudson, Wei Chen, R. Greenberger
High Resolution Imaging Science Experiment (HiRISE) observations of glacial and periglacial morphologies in the circum-Argyre Planitia highlands, Mars
The landscape of the Argyre Planitia and adjoining Charitum and Nereidum Montes in the southern hemisphere of Mars has been heavily modified since formation of the Argyre impact basin. This study examines morphologies in the Argyre region revealed in images acquired by the High Resolution Imaging Science Experiment (HiRISE) camera and discusses the implications for glacial and periglacial processe
Authors
Maria E. Banks, Alfred S. McEwen, Jeffrey S. Kargel, Victor R. Baker, Robert G. Strom, Michael T. Mellon, Virginia C. Gulick, Laszlo P. Keszthelyi, Kenneth E. Herkenhoff, Jon D. Pelletier, Windy L. Jaeger
Hematite spherules at Meridiani: results from MI, Mini-TES, and Pancam
We report on observations of hematite‐bearing spherules at Meridiani Planum made using the Microscopic Imager (MI), Mini‐Thermal Emission Spectrometer (Mini‐TES), and Panoramic Camera (Pancam) instruments on the Mars Exploration Rover Opportunity. Spherules were observed on soil surfaces and in outcrop rocks, both on undisturbed surfaces and in abraded surfaces ground using the Rock Abrasion Tool
Authors
W. M. Calvin, J.D. Shoffner, J. R. Johnson, A.H. Knoll, J.M. Pocock, S. W. Squyres, C.M. Weitz, R. E. Arvidson, J.F. Bell, P. R. Christensen, P. A. de Souza, W. H. Farrand, T.D. Glotch, Kenneth E. Herkenhoff, B.L. Jolliff, A.T. Knudson, S. M. McLennan, A.D. Rogers, S.D. Thompson
Seasonally active frost-dust avalanches on a north polar scarp of Mars captured by HiRISE
North-polar temporal monitoring by the High Resolution Imaging Science Experiment (HiRISE) orbiting Mars has discovered new, dramatic examples that Mars1 CO2-dominated seasonal volatile cycle is not limited to quiet deposition and sublimation of frost. In early northern martian spring, 2008, HiRISE captured several cases of CO2 frost and dust cascading down a steep, polar scarp in discrete clouds.
Authors
Patrick S. Russell, Nicolas Thomas, Shane Byrne, Kenneth E. Herkenhoff, Kathryn E. Fishbaugh, Nathan Bridges, Chris Okubo, Moses P. Milazzo, Ingrid J. Daubar, Candice J. Hansen, Alfred S. McEwen
Wind-driven particle mobility on Mars: Insights from Mars Exploration Rover observations at "El Dorado" and surroundings at Gusev Crater
The ripple field known as 'El Dorado' was a unique stop on Spirit's traverse where dust-raising, active mafic sand ripples and larger inactive coarse-grained ripples interact, illuminating several long-standing issues of Martian dust mobility, sand mobility, and the origin of transverse aeolian ridges. Strong regional wind events endured by Spirit caused perceptible migration of ripple crests in d
Authors
R. Sullivan, R. Arvidson, J.F. Bell, Ralf Gellert, M. Golombek, R. Greeley, Kenneth E. Herkenhoff, J. Johnson, S. Thompson, P. Whelley, J. Wray
Windy Mars: A dynamic planet as seen by the HiRISE camera
With a dynamic atmosphere and a large supply of particulate material, the surface of Mars is heavily influenced by wind-driven, or aeolian, processes. The High Resolution Imaging Science Experiment (HiRISE) camera on the Mars Reconnaissance Orbiter (MRO) provides a new view of Martian geology, with the ability to see decimeter-size features. Current sand movement, and evidence for recent bedform d
Authors
Nathan T. Bridges, Paul E. Geissler, Alfred S. McEwen, B.J. Thomson, Frank C. Chuang, Kenneth E. Herkenhoff, Laszlo P. Keszthelyi, Sara Martinez-Alonso
Mars reconnaissance orbiter's high resolution imaging science experiment (HiRISE)
The HiRISE camera features a 0.5 m diameter primary mirror, 12 m effective focal length, and a focal plane system that can acquire images containing up to 28 Gb (gigabits) of data in as little as 6 seconds. HiRISE will provide detailed images (0.25 to 1.3 m/pixel) covering ∼1% of the Martian surface during the 2‐year Primary Science Phase (PSP) beginning November 2006. Most images will include col
Authors
Alfred S. McEwen, Eric M. Eliason, James W. Bergstrom, Nathan T. Bridges, Candice J. Hansen, W. Alan Delamere, John A. Grant, Virginia C. Gulick, Kenneth E. Herkenhoff, Laszlo P. Keszthelyi, Randolph L. Kirk, Michael T. Mellon, Steven W. Squyres, Nicolas Thomas, Catherine M. Weitz
Evidence for montmorillonite or its compositional equivalent in Columbia Hills, Mars
During its exploration of the Columbia Hills, the Mars Exploration Rover "Spirit" encountered several similar samples that are distinctly different from Martian meteorites and known Gusev crater soils, rocks, and sediments. Occurring in a variety of contexts and locations, these "Independence class" samples are rough-textured, iron-poor (equivalent FeO ??? 4 wt%), have high Al/Si ratios, and often
Authors
B. C. Clark, R. E. Arvidson, Ralf Gellert, R.V. Morris, D. W. Ming, L. Richter, S. W. Ruff, J.R. Michalski, W. H. Farrand, A. S. Yen, Kenneth E. Herkenhoff, R. Li, S. W. Squyres, C. Schroder, G. Klingelhofer, J.F. Bell