Astrogeology Science Center

Publications

Filter Total Items: 889
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Year Published: 1999

Dark material in the polar layered deposits and dunes on Mars

Viking infrared thermal mapping and bistatic radar data suggest that the bulk density of the north polar erg material is much lower than that of the average Martian surface or of dark dunes at lower latitudes. We have derived a thermal inertia of 245–280 J m−2 s−1/2 K−1 (5.9–6.7×10−3 cal cm−2 s−1/2 K−1) for the...

Herkenhoff, Kenneth E.; Vasavada, Ashwin R.

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Year Published: 1999

Digital mapping of the Mars Pathfinder landing site: Design, acquisition, and derivation of cartographic products for science applications

The Imager for Mars Pathfinder (IMP) acquired more than 16,000 images and provided panoramic views of the surface of Mars at the Mars Pathfinder landing site in Ares Vallis. This paper describes the stereoscopic, multispectral IMP imaging sequences and focuses on their use for digital mapping of the landing site and for deriving cartographic...

Gaddis, Lisa R.; Kirk, Randolph L.; Johnson, J. R.; Soderblom, Laurence A.; Ward, A. W.; Barrett, J.; Becker, Kris J.; Becker, Tammy L.; Blue, J.; Cook, D.; Eliason, E.; Hare, Trent M.; Howington-Kraus, Elpitha; Isbell, C.; Lee, E.M.; Redding, Bonnie L.; Sucharski, Robert M.; Sucharski, Tracie L.; Smith, P.H.; Britt, D.T.

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Year Published: 1999

Digital photogrammetric analysis of the IMP camera images: Mapping the Mars Pathfinder landing site in three dimensions

This paper describes our photogrammetric analysis of the Imager for Mars Pathfinder data, part of a broader program of mapping the Mars Pathfinder landing site in support of geoscience investigations. This analysis, carried out primarily with a commercial digital photogrammetric system, supported by our in‐house Integrated Software for Imagers and...

Kirk, Randolph L.; Howington-Kraus, Elpitha; Hare, Trent M.; Dorrer, E.; Cook, D.; Becker, Kris J.; Thompson, K.; Redding, B.; Blue, J.; Galuszka, D.; Lee, E.M.; Gaddis, Lisa R.; Johnson, J. R.; Soderblom, Laurence A.; Ward, A. W.; Smith, P.H.; Britt, D.T.

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Year Published: 1999

General geology and geomorphology of the Mars Pathfinder landing site

The Mars Pathfinder (MPF) spacecraft landed on relatively young (late Hesperian-early Amazonian; 3.1-0.7 Ga) plains in Chryse Planitia near the mouth of Ares Vallis. Images returned from the spacecraft reveal a complex landscape of ridges and troughs, large hills and crater rims, rocks and boulders of various sizes and shapes, and surficial...

Ward, A. W.; Gaddis, Lisa R.; Kirk, Randolph L.; Soderblom, Laurence A.; Tanaka, K.L.; Golombek, M.P.; Parker, T.J.; Greeley, Ronald; Kuzmin, R.O.

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Year Published: 1999

Geology of the Upheaval Dome impact structure, southeast Utah

Two vastly different phenomena, impact and salt diapirism, have been proposed for the origin of Upheaval Dome, a spectacular scenic feature in southeast Utah. Detailed geologic mapping and seismic refraction data indicate that the dome originated by collapse of a transient cavity formed by impact. Evidence is as follows: (1) sedimentary strata in...

Kriens, Bryan J.; Shoemaker, Eugene M.; Herkenhoff, Kenneth E.

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Year Published: 1999

Imager for Mars Pathfinder (IMP) image calibration

The Imager for Mars Pathfinder returned over 16,000 high-quality images from the surface of Mars. The camera was well-calibrated in the laboratory, with <5% radiometric uncertainty. The photometric properties of two radiometric targets were also measured with 3% uncertainty. Several data sets acquired during the cruise and on Mars confirm that...

Reid, R.J.; Smith, P.H.; Lemmon, M.; Tanner, R.; Burkland, M.; Wegryn, E.; Weinberg, J.; Marcialis, R.; Britt, D.T.; Thomas, N.; Kramm, R.; Dummel, A.; Crowe, D.; Bos, B.J.; Bell, J.F.; Rueffer, P.; Gliem, F.; Johnson, J. R.; Maki, J.N.; Herkenhoff, Kenneth E.; Singer, Robert B.

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Year Published: 1999

Preliminary results on photometric properties of materials at the Sagan Memorial Station, Mars

Reflectance measurements of selected rocks and soils over a wide range of illumination geometries obtained by the Imager for Mars Pathfinder (IMP) camera provide constraints on interpretations of the physical and mineralogical nature of geologic materials at the landing site. The data sets consist of (1) three small “photometric spot” subframed...

Johnson, Jeffrey R.; Kirk, Randolph L.; Soderblom, Laurence A.; Gaddis, Lisa R.; Reid, Robert J.; Britt, Daniel T.; Smith, Peter; Lemmon, Mark T.; Thomas, Nicolas; Bell, James F. ; Bridges, Nathan T.; Anderson, Robert; Herkenhoff, Kenneth E.; Maki, Justin N.; Murchie, Scott L.; Dummel, Andreas; Jaumann, Ralf; Trauthan, Frank; Arnold, Gabriele

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Year Published: 1999

Ventifacts at the Pathfinder landing site

About half of the rocks at the Mars Pathfinder Ares Vallis landing site appear to be ventifacts, rocks abraded by windborne particles. Comparable resolution images taken by the Imager for Mars Pathfinder (IMP) camera and the Viking landers show that ventifacts are more abundant at the Pathfinder site. The ventifacts occur in several forms,...

Bridges, N.T.; Greeley, R.; Haldemann, A.F.C.; Herkenhoff, Kenneth E.; Kraft, M.; Parker, T.J.; Ward, A. W.

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Year Published: 1998

U. S. Geolgogical Survey Flagstaff Field Center

The United States Geological Survey Flagstaff Field Center was founded by the late Eugene Shoemaker in 1963 as a research site for the new science of planetary geology. Flagstaffs clear air and high elevation made it a desirable location for telescope observations of the Moon and planets and nearby Meteor Crater was a superb training ground for...

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Year Published: 1998

Triton

No abstract available.

Weissman, Paul; McKinnon, William B; Kirk, Randolph L.

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Year Published: 1998

Coastal-change and glaciological maps of Antarctica

No abstract available.

Lucchitta, Baerbel K.
Coastal-change and glaciological maps of Antarctica; 1998; FS; 050-98; Geological Survey (U.S.)

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Year Published: 1998

Geologic map of the MTM -85280 quadrangle, Planum Australe region of Mars

The polar deposits on Mars are of great interest because they probably record martian climate variations (Thomas and others, 1992). The area shown on this map includes polar layered deposits with distinct low-albedo features and a sharp boundary between the layered deposits and the moderately cratered unit that forms the floor of Chasma Australe....

Herkenhoff, Kenneth E.