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  • LUNAR AND PLANETARY EXPLORATION  (39)
  • Astrophysics  (25)
  • 1995-1999  (22)
  • 1985-1989  (42)
  • 1
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    IRAS constraints on the sizes of Pluto and Charon (1987)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Thermal emission models indicate that Charon contributes a significant amount of the infrared radiation detected by IRAS during the observation of mutual eclipse events. The IRAS observations also show that the most probable diameters for Pluto and Charon are 2200 and 1300 (+ or - 150) km. These results are consistent with there being some atmosphere on Pluto.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature (ISSN 0028-0836); 327; 127-129
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  • 2
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    Interplanetary dust particles collected in the stratosphere - Observations of atmospheric heating and constraints on their interrelationships and sources (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: TEM and IR spectroscopy investigations of the interplanetary dust particles (IDPs) collected in the stratosphere have shown the majority of IDPs in the layer-lattice silicate and pyroxene classes to not have been heated to temperatures above 600 C during atmospheric entry. This implies that they arrive at the upper atmosphere with low geocentric encounter velocities, and limits the possible encounter trajectories for these particles to relatively circular prograde orbits. On this basis, it is judged unlikely that these IDPs are from earth-crossing comets or asteroids; collected IDPs dominated by olivine include a larger portion of above-600 C-heated particles, suggesting their capture from more eccentric orbits.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 82; 146-166
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  • 3
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    New type of primitive meteorite found in Antarcitca (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: A stony meteorite found in Antarctica in 1985, recently identified as a type of chondrite, probably represents material from a previously unsampled region of the solar system. Scientists are currently debating how the object formed. Preliminary results on Allan Hills 85085 (ALH85085) were presented.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Inst., Nineteenth Lunar and Planetary Science Conference. Press abstracts; p 12-13
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  • 4
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    Documenting volcano-tectonic episodes in Mars' stratigraphic record (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Global geologic maps of Mars at 1:15,000,000 scales were digitized to obtain accurate measurements of the areal extent of 90 geologic units. These data were used to determine the resurfacing history of Mars by volcanic, eolian, fluvial, periglacial, and impact processes. This work is presently being extended to focus on the extent, magnitude, and duration of volcanism and tectonism (mainly faulting) throughout each of the three time-stratigraphic systems. This work involves detailed mapping to assess volcano-tectonic episodes in terms of their occurrence in eight epochs that represent subdivisions of Martian periods.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Inst., MEVTV Workshop on Nature and Composition of Surface Units on Mars; p 120-121
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  • 5
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    Mars Geologic Mapping: a Review and New Concepts (1985)
    In:  CASI
    Details
    Publication Date: 2014-10-09
    Description: The final version of the 1.15 m scale geologic map of the western equatorial region of Mars based on Viking pictures has been completed in open file format. Geologic maps of the north and south polar regions were completed in provisional form. A map of the eastern equatorial region is in compilation. Evidences of erosion, water flooding, volcanic activity, and primary and satellite craters in these areas are discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984; p 541-543
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  • 6
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    Faulting and its relation to volcanism: Mars western equatorial region (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Recently completed geologic maps of Mars show the global distribution of lava flows that were emplaced during each of the three Martian time-stratigraphic periods and the faults and ridges that originated during these periods. These data were extracted from the geologic maps to make a series of volcano-tectonic maps for the Noachian, Hesperian, and Amazonian Periods. The map series is being compiled on Viking photomosaics at 1:15,000,000 scale. These maps will provide a basis for assessing the interactive roles of volcanism and tectonism in the crustal evolution of Mars.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Inst., NASA MEVTV Program Working Group Meeting: Volcanism on Mars; p 5-7
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  • 7
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    Mars sample return: Recommended sites (1988)
    In:  CASI
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    Publication Date: 2013-08-31
    Description: Site selection priorities for a Mars sample return are constrained by the risks due to terrain that affect the successful descent and mobility of the sampling vehicle. At this time, evaluations of terrain roughness can be made only in a very general way. For this reason, the two candidate sites discussed are provisionally recommended primarily on the basis of their scientific value; however, no adverse surface conditions are discernable at these locations at the resolution of Viking images. The rationale is given for the selection of the sites.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Inst., Workshop on Mars Sample Return Science; p 151-153
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  • 8
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    Martian sample sites: Examples based on a global geologic perspective (1988)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Ten areas were selected that each include several rock units of varying lithology and age. These areas were chosen to optimize the geologic and chronologic data return from Mars. Geologic mapping and stratigraphic studies identify stratigraphic ages, rock types, and information on Martian geologic history that samples of a given site may yield. Volcanic rocks occur over much of the planet and in virtually all stratigraphic positions, and they are amenable to radioisotopic dating. Therefore, a reasonable and essential goal for a sample return mission is to return datable rocks from widely varying strata. Generally, about three or four major geologic units can be sampled at any of the given sites, most of which can probably be dated. The Mars Observer mission will aid greatly in interpreting lithology and defining contacts at the high resolution required to actually pinpoint good sample acquisition sites within these areas.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Inst., Workshop on Mars Sample Return Science; p 154-155
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  • 9
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    Local-scale stratigraphy of grooved terrain on Ganymede (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The surface of the Jovian satellite, Ganymede, is divided into two main units, dark terrain cut by arcuate and subradial furrows, and light terrain consisting largely of areas with pervasive U-shaped grooves. The grooved terrain may be subdivided on the basis of pervasive morphology of groove domains into four terrain types: (1) elongate bands of parallel grooves (groove lanes); (2) polygonal domains of parallel grooves (grooved polygons); (3) polygonal domains of two orthogonal groove sets (reticulate terrain); and (4) polygons having two to several complexly cross-cutting groove sets (complex grooved terrain). Reticulate terrain is frequently dark and not extensively resurfaced, and grades to a more hummocky terrain type. The other three grooved terrain types have almost universally been resurfaced by light material during their emplacement. The sequence of events during grooved terrain emplacement has been investigated. An attempt is made to integrate observed geologic and tectonic patterns to better constrain the relative ages and styles of emplacement of grooved terrain types. A revised model of grooved terrain emplacement is proposed and is tested using detailed geologic mapping and measurement of crater density.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 505-507
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  • 10
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    Origin of fractures, Martian polygonal terrain (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: It has been proposed that the origin of the polygonally fractured terrain on Mars is due to stress caused by differential settling of material deposited over an irregular base topography. The eventual goal of this study is to evaluate this proposal by construction of mathematical models for this process. These models will attempt to determine what combinations of base topography, covering material composition, and depositional rate would cause the fractures observed. Because fracture formation would largely be a function of generated stress, the first step in modeling is calculation of stresses created during settlement.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 495-496
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