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  • LUNAR AND PLANETARY EXPLORATION  (3,213)
  • 1980-1984  (3,213)
  • 1
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    Voyages to Saturn (1982)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The Voyager mission to Saturn is explained in detail. A history of Saturn observations from ancient times to the present is given. The Voyager spacecraft and their instruments are described. An overview of planetary astronomy is presented. The text is supplemented by numerous black and white and color photographs. The Saturn satellites are discussed in detail, and preliminary pictorial maps of the satellites are given.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-SP-451 , NAS 1.21:451 , LC-81-600073
    Format: application/pdf
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  • 2
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    The Viking seismometry (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Efforts were made to determine the seismicity of Mars as well as define its internal structure by detecting vibrations generated by marsquakes and meteoroid impacts. The lack of marsquakes recognized in the Viking data made it impossible to make any direct inferences about the interior of Mars and only allowed the setting of upper bounds on the seismic activity of the planet. After obtaining more than 2100 hours worth of data during the quite periods at rates of one sample per second or higher, the Viking 2 seismometer was turned off as a consequence of a landing system failure. During the periods when adequate data were obtained, one event of possible seismic or meteoroid impact origin was recognized; however, there is a significant probability that this event was generated by a wind gust.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-3408
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  • 3
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    Meteorite analysis assists search for life (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-NEWS-RELEASE-80-21 , P80-10024
    Format: application/pdf
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  • 4
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    The International Halley Watch (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: In preparation for the 1985 to 1986 apparition of Halley's Comet, the International Halley Watch (IHW) has initiated a comprehensive program to simulate, encourage, and coordinate scientific observation of the apparition. The observing groups with which the IHW plans to interact are discussed and the ground based observing nets are described in detail. An outline of the history of observations of Halley's Comet and a synopsis of comet properties and physics are included.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-82181
    Format: application/pdf
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  • 5
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    Crater numbers and geological histories of Iapetus, Enceladus, Tethys and Hyperion (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The surfaces of the Saturn satellites Tethys, Iapetus and Encedalus display surfaces which indicate active geological processes and therefore suggest a degree of internal evolution. By contrast, the Saturn satellite Hyperion and the coorbitals 1980S1 and 1980S3 show no trace of geological activity and may be fragments of once-larger bodies. Activity on Iapetus appears to have been confined to the dark terrain, and offers no clue as to its timing and extent. The widest terrain type and crater number variations are those of Encedalus, which indicate the most prolonged period of geological activity of any of the satellites studied.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 301; Feb. 24
    Format: text
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  • 6
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    Thermal inertia mapping of Mars from 60 deg S to 60 deg N (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The considered region comprises 81% of the surface of Mars. Thermal inertia I is a composite surface property, which is equal to the square root of the product of three factors, including the thermal conductivity, the density, and the specific heat. I is the sole thermal parameter which governs the temperature variation of a periodically heated homogeneous surface, and, as such, is the prime intermediary between remote temperature observations and their geologic interpretation. The values for the thermal inertia found imply particulate surface materials. The variation in Martian surface thermal conductivity is about two orders of magnitude. Three large regions of low-inertia material are defined. Low-inertia material always possesses high albedo. There is a general tendency for higher-thermal-inertia surfaces to be darker but exceptions occur which may be related to a thin mantling of light dust or bonding of light material.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 45; Feb. 198
    Format: text
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  • 7
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    Application of the method of discrete ordinates to the solution of the transport equation in the case of an inhomogeneous planetary atmosphere (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A version of the method of discrete ordinate (MDO) which can be used for an optically thick inhomogeneous atmosphere was developed. The MDO may be implemented as an algorithm simpler than those proposed earlier. The algorithm is the same for each azimuth dependent component of intensity. The MDO can determine the scattered radiation field over its entire length along the vertical. It is shown the MDO, when used for homogeneous atmospheres is in agreement with the results obtained by other methods.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-76204 , PR-377
    Format: application/pdf
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  • 8
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    Modification of the flow pass method as applied to problems of chemistry of planet atmospheres (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: It was shown that the modified flow pass method possesses considerable effectiveness, both in the case when the coefficient of diffusion changes severely in the examined region and in the case when diffusion is the prevalent process, as compared with chemical reactions. The case when a regular pass proves inapplicable, or applicable in a limited interval of the decisive parameters, was examined.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-76203
    Format: application/pdf
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  • 9
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    Reports of Planetary Geology Program, 1982 (1982)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Work conducted in the Planetary Geology program is summarized. The following categories are presented: outer solar system satellites; asteroids and comets; Venus; cratering processes and landform development; volcanic processes and landforms; aolian processes and landforms; fluvial processes and landform development; periglacial and permafrost processes; structure, tectonics and stratigraphy; remote sensing and regolith studies; geologic mapping, cartography and geodesy.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-85127 , EL-4 , NAS 1.15:85127
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  • 10
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    Advances in Planetary Geology (1982)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Advances in Planetary Geology is a new series intended to serve the planetary geology community with a form for quick and thorough communications. There are no set lists of acceptable topics or formats, and submitted manuscripts will not undergo a formal review. All submissions should be in a camera ready form, preferably spaced, and submitted to the editor.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-84894 , EL-4 , NAS 1.15:84894
    Format: application/pdf
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