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  • LUNAR AND PLANETARY EXPLORATION  (710)
  • Biochemistry and Biotechnology  (328)
  • 1980-1984  (1,038)
  • 1982  (1,038)
Collection
Keywords
Publisher
Years
  • 1980-1984  (1,038)
Year
  • 11
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    Ephemerides and observations of Mars by means of an astrolabe (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: In: Sun and planetary system; Oct 19, 1981 - Oct 23, 1981; Dubrovnik; Yugoslavia
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Origin of regular satellites (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The regular satellites of Jupiter and Saturn are generally believed to have accreted within cooling circumplanetary nebulae. Small silicate bodies are lost into the planet by gas drag before ice can condense. Larger silicate protosatellites survive by exerting tidal torques on the gas, clearing low-density 'tunnels' around their orbits. The nebula is thus divided into a series of gas rings depleted in silicates. Cooling eventually allows ice condensation, yielding another generation of icy bodies. Collisional accretion of these objects accounts for stochastic density variations of Saturn's inner satellites. High dynamic pressure may have prevented accretion in the inner part of the Jovian nebula; J5 may be an ablated remnant of a larger body.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: The comparative study of the planets; Sep 14, 1981 - Sep 25, 1981; Vulcano; Italy
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    NASA TECHNICAL REPORTS
  • 13
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    Aeolian modification of planetary surfaces (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Any planet or satellite having a dynamic atmosphere and a solid surface is subject to aeolian or wind processes. A survey of the solar system shows that earth, Mars, Venus, and possibly Titan meet these criteria. Attention is given to the relevance of aeolian processes to planetary geology, approaches for investigating aeolian processes, observations on Mars, conditions on Venus, and studies of Titan with the aid of the Voyager spacecraft. It is found that aeolian processes play an important role in the modification of the surfaces of earth and Mars. Indirect evidence suggests that Venus and perhaps Titan also may experience aeolian activity. Study of aeolian activity in a planetary context thus affords the opportunity to examine a fundamental process under a wide range of environmental conditions. Each planet can be viewed as a vast natural laboratory.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: The comparative study of the planets; Sep 14, 1981 - Sep 25, 1981; Vulcano; Italy
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    NASA TECHNICAL REPORTS
  • 14
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    Origin and evolution of the giant planets (1982)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: A discussion is presented of two major giant planet origin hypotheses: (1) protoplanet formation in the solar nebula in the form of a gravitationally unstable, gaseous subcondensation, subsequently evolving as a chemically homogeneous object until a stage at which a solid core may form; and (2) solid core formation by accumulation of planetesimals, followed by the accretion of solar-composition gas onto the core until it becomes unstable to collapse. Under either of the scenarios, evolution is found to comprise an early, cool phase in hydrostatic equilibrium, a hydrodynamic collapse, and a final phase of hydrostatic contraction and cooling to the present state. Attention is given to the physical processes that are most important in the determination of evolutionary characteristics. A concluding note on the cases of Uranus and Neptune is also given.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: The comparative study of the planets; Sep 14, 1981 - Sep 25, 1981; Vulcano; Italy
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    NASA TECHNICAL REPORTS
  • 15
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    Comments on 'Xe129 and the origin of CCF xenon in meteorites' by R. S. Lewis and E. Anders (1982)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1981 - Mar 20, 1981; Houston, TX
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    NASA TECHNICAL REPORTS
  • 16
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    Microstructure and particulate properties of the surfaces of Io and Ganymede - Comparison with other solar system bodies (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The phase curves of Io and Ganymede between 0 and 40 deg solar phase angle have been compiled from Voyager photopolarimeter and ground-based observations. Modeling the data with the Lumme-Bowell theory made it possible to determine improved estimates of the surface texture and particulate properties. Accurate V-band zero-phase geometric albedos, phase integrals, and Bond albedos are also obtained. The properties of the particles on Io's surface appear to be different from those of other solar system objects whose surfaces are totally controlled by impact cratering processes. Sulfur and SO2 frost, previously identified by spectral analysis, seem to exist in a physical form not commonly found on earth. The agglomeration of volcanic ash into aggregates on Io's surface is postulated.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1981 - Mar 20, 1981; Houston, TX
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    NASA TECHNICAL REPORTS
  • 17
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    Landing induced dust clouds on Venus and Mars (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Spacecraft landings on Mars and Venus provide an opportunity to seek and discover transient dust phenomena with various instruments, and to make inferences about local-scale surface modification processes. The present study is concerned with such dust phenomena. In addition, an attempt is made to relate all of the landing sites on Venus to each other in terms of dust phenomena. On Mars a difference in the magnitude of dust effects was observed between the Viking Lander 1 (VL-1) and Viking Lander 2 (VL-2) sites, which is due to either a particle size variation, or the degree of surface blockiness. It appears that the blocks at VL-2 have somewhat protected the surface fines from being raised by retroengine exhaust. The Venera 10 panorama contains a zone of darkening similar to that in the VL-1 zone.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1981 - Mar 20, 1981; Houston, TX
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    NASA TECHNICAL REPORTS
  • 18
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    A secondary origin for the central plateau of Hebes Chasma (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Hebes Chasma, one of the northern members of the Valles Marineris, can be divided into three physiographic provinces; chasma walls, chasma floor, and central plateau. Theories of origin of the 5-kilometer-high central plateau include (1) the plateau is an eroded remnant of the surrounding plains, and (2) the plateau is a secondary feature deposited after formation of the chasma. A secondary eolian or pyroclastic origin best explains the morphology of the plateau. The chasma probably formed by collapse of a pre-existing graben that was widened by landslides and subsequently filled with eolian or pyroclastic material. Continued mass wasting isolated the plateau from the chasma walls. The enclosed nature of Hebes Chasma may have inhibited eolian erosion and transport within the trough, so that the relatively fresh appearance of the plateau has been preserved.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1981 - Mar 20, 1981; Houston, TX
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    NASA TECHNICAL REPORTS
  • 19
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    Mars' global properties - Maps and applications (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Mars data sets from many sources have been put into a common digital format and global maps at constant scale have been produced. These formatted data sets form the basis of the Mars Consortium. They currently include maps of geology, volcanic units, channels, wind features, topography, gravity, Viking approach and apoapsis color, predawn temperature residuals, thermal inertia, radiometric and solar albedo, water vapor abundance, 1.4 micrometers albedo, crater abundance, Earth-based radar and photographic telescope observations, and terrestrial spectral observations. The generation of these data sets is briefly described. As an example of their use, the mapped geologic units are characterized in terms of color, predawn temperature and elevation, and unusual areas identified. The Oxia Palus region is examined as an example of combining higher resolution data with the Consortium data sets. Use of the existing data sets and submission of new ones are encouraged.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1981 - Mar 20, 1981; Houston, TX
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    NASA TECHNICAL REPORTS
  • 20
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    Complementary rare earth element patterns in unique achondrites, such as ALHA 77005 and shergottites, and in the earth (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Abundances of major, minor, and trace elements are determined in the Antarctic achondrite Allan Hills (ALHA) 77005 via sequential instrumental and radiochemical neutron activation analysis. The rare earth element (REE) abundances of ALHA 77005 reveal a unique chondritic normalized pattern; that is, the REEs are nearly unfractionated from La to Pr at approximately 1.0X chondrites, monotonically increased from Pr to Gd at approximately 3.4X with no Eu anomaly, nearly unfractionated from Gd and Ho and monotonically decreased from Ho to Lu at approximately 2.2X. It is noted that this unique REE pattern of ALHA 77005 can be modeled by a melting process involving a continuous melting and progressive partial removal of melt from a light REE enriched source material. In a model of this type, ALHA 77005 could represent either a crystallized cumulate from such a melt or the residual source material. Calculations show that the parent liquids for the shergottites could also be derived from a light REE enriched source material similar to that for ALHA 77005.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 16, 1981 - Mar 20, 1981; Houston, TX
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