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  • LUNAR AND PLANETARY EXPLORATION  (601)
  • 1980-1984  (601)
  • 1981  (601)
  • 1
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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
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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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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    NASA TECHNICAL REPORTS
  • 3
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    Press conference on Voyager 2 Saturn encounter (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: P81-10211
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Advances in planetary geology (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: This second issue in a new series intended to serve the planetary geology community with a form for quick and thorough communications includes (1) a catalog of terrestrial craterform structures for northern Europe; (2) abstracts of results of the Planetary Geology Program, and (3) a list of the photographic holdings of regional planetary image facilities.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-83089
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Voyager backgrounder (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The Voyager spacecraft and experiments are described. The spacecraft description includes the structure and configuration, communications systems, power supplies, computer command subsystems, and the science platform. The experiments discussed are investigations of cosmic rays, low-energy charged particles, magnetic fields, and plasma waves, along with studies in radio astronomy photopolarimetry. The tracking and data acquisition procedures for the missions are presented.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-NEWS-RELEASE-81-116 , P81-10118
    Format: application/pdf
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  • 6
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    Encounter with Saturn - Voyager 1 imaging science results (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: As Voyager 1 flew through the Saturn system it returned photographs revealing many new and surprising characteristics of this complicated community of bodies. Saturn's atmosphere has numerous, low-contrast, discrete cloud features and a pattern of circulation significantly different from that of Jupiter. Titan is shrouded in a haze layer that varies in thickness and appearance. Among the icy satellites there is considerable variety in density, albedo, and surface morphology and substantial evidence for endogenic surface modification. Trends in density and crater characteristics are quite unlike those of the Galilean satellites. Small inner satellites, three of which were discovered in Voyager images, interact gravitationally with one another and with the ring particles in ways not observed elsewhere in the solar system. Saturn's broad A, B, and C rings contain hundreds of 'ringlets', and in the densest portion of the B ring there are numerous nonaxisymmetric features. The narrow F ring has three components which, in at least one instance, are kinked and crisscrossed. Two rings are observed beyond the F ring, and material is seen between the C ring and the planet.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 212; Apr. 10
    Format: text
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  • 7
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    NASA Facts: Images of Saturn from Voyager 2 (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: Six color images of Saturn and four of her moons, acquired by Voyager 2, are presented. A brief narrative and explanatory captions, including explanations of the planet's atmosphere and rings, are presented.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-NF-132/10-81
    Format: application/pdf
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  • 8
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    Advances in planetary geology (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: Three dissertations are provided covering (1) the stochastic evolution of asteroidal regoliths and the origin of brecciated and gas-rich meteorites; (2) ridge systems on Mars; and (3) the morphology and evolution of Ganymede and Callisto.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-84412
    Format: application/pdf
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  • 9
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    Radar investigation of asteroids (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: Radar investigations were conducted of selected minor planets, including: (1) observations during 1981-82 of 10 potential targets (2 Pallas, 8 Flora, 12 Victoria, 15 Eunomia, 19 Fortuna, 22 Kalliope, 132 Aethra, 219 Thusnelda, 433 Eros, and 2100 Ra-Shalom); and (2) continued analyses of observational data obtained during 1980-81 for 10 other asteroids (4 Vesta, 7 Iris, 16 Psyche, 75 Eurydike, 97 Klotho, 216 Kleopatra, 1685 Toro, 1862 Apollo, 1865 Cerberus, and 1915 Quetzalcoatl). Scientific objectives include estimation of echo strength, polarization, spectral shape, spectral bandwidth, and Doppler shift. These measurements: (1) yield estimates of target size, shape, and spin vector; (2) place constraints on topography, morphology, and composition of the planetary surface; (3) yield refined estimates of target orbital parameters; (4) reveal the presence of asteroidal satellites.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-164554
    Format: application/pdf
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  • 10
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    Reports of Planetary Geology Program, 1981 (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: Abstracts of 205 reports from Principal investigators of NASA's Planetary Geology Program succinctly summarize work conducted and reflect the significant accomplishments. The entries are arranged under the following topics: (1) Saturnian satellites; (2) asteroids, comets and Galilean satellites; (3) cratering processes and landform development; (4) volcanic processes and landforms; (5) Aerolian processes and landforms; (6) fluvial, preglacial, and other processes of landform development; (7) Mars polar deposits, volatiles, and climate; (8) structure, tectonics, and stratigraphy; (9) remote sensing and regolith chemistry; (10) cartography and geologic mapping; and (11) special programs.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-84211
    Format: application/pdf
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