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  • Other Sources  (1,311)
  • LUNAR AND PLANETARY EXPLORATION  (1,311)
  • Inorganic Chemistry
  • 2025-2025
  • 2020-2022
  • 1990-1994  (613)
  • 1980-1984
  • 1975-1979  (698)
  • 1990  (613)
  • 1978  (698)
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  • 1990-1994  (613)
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  • 1975-1979  (698)
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  • 1
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    Lunar meteorite Yamato-86032 - Mineralogical, petrological, and geochemical studies (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Yamato-86032 is a shock-lithified anorthositic fragmental breccia. It consists mainly of highly feldspathic meta-breccias and meta-meltrocks and possibly contains a small contribution from mare lithologies, but there is no indication of a KREEP component. In many respects Y-86032 is similar to the previously described lunar meteorites Y-82192/3, but there are some notable differences. We have analyzed about 40 major and trace elements in bulk matrix, impact melt, and clast samples from two chips of Y-86032. The abundances of most lithophile and incompatible elements are lower in Y-86032 than in Y-82192 (which contains very low abundances compared to normal lunar highland rocks). The REE abundances are comparable to those of Y-82192. The elements Sc, Cr, Mn, Fe and Co have significantly lower abundances than in Y-82192, and the siderophile element pattern is also different. Since cosmic ray exposure data indicate pairing of Y-86032 with Y-82192/3, the source region for these meteorites on the moon must have been fairly heterogeneous.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: ; : Problems in the ae
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  • 2
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    News conference on Voyager-2-Jupiter encounter (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The proceedings of a news conference on the Voyager 2 Jupiter project are presented. Topics include the instrumentation on the Voyager 2, Jupiter's atmosphere and magnetic field, the Jupiter moons, and the observations of lightning on Jupiter.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-80854 , P79-10189
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  • 3
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    Ages of flow units in the far eastern maria and implications for basin-filling history (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The spatial distribution of major units of uniform relative age exposed in the far eastern maria and Mare Humorum was determined using a crater density mapping technique. Correlation of crater densities and radiometric ages of Apollo and Luna landing sites provided estimates of the absolute ages for the units. The combination of such data with relative age data from previous crater morphology studies produced a complete map of the distribution of major age units in the lunar near-side maria. The map shows that there are young (2.5 + or - 0.5 billion years old) mare basalts in the eastern maria, although most young flows occur in the western maria. The vents for the young flows generally are found along the edges of basins. Because old mare units (greater than 3.5 billion years old) are also commonly found around the edges of the basins, it is suggested that the basins were subsiding during filling, probably as a result of isostatic compensation due to the weight of the lava.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 13, 1978 - Mar 17, 1978; Houston, TX
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  • 4
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    Galileo orbiter spacecraft and instrumentation (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The Galileo Jupiter orbiter and its science investigations are briefly described as a baseline design for a Saturn orbiter.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: JPL The Saturn System; p 379-384
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  • 5
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    Asteroids: An Exploration Assessment (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The current state of asteroid science is assessed. Future space missions to gain more knowledge on asteroid relationship to solar system formation are outlined.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CP-2053 , Jan 19, 1978 - Jan 21, 1978; Chicago
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  • 6
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    Radiophysical investigations of Venus from spacecraft (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The atmosphere and topography of Venus were studied in detail from the Venera-9 and Venera-10. Research on plasma around the Sun was also carried out. Information on pressure, temperature and gas composition of the atmosphere in five regions of the planet was obtained. The Venera-9 and Venera-10 transmitted useful information for several months, making a detailed study possible. Radio waves and fluoroscopy were used as the research methods.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-75578
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  • 7
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    A bibliography of planetary geology principal investigators and their associates, 1976-1978 (1978)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: This bibliography cites publications submitted by 484 principal investigators and their associates who were supported through NASA's Office of Space Sciences Planetary Geology Program. Subject classifications include: solar system formation, comets, and asteroids; planetary satellites, planetary interiors, geological and geochemical constraints on planetary evolution; impact crater studies, volcanism, eolian studies, fluvian studies, Mars geological mapping; Mercury geological mapping; planetary cartography; and instrument development and techniques. An author/editor index is provided.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-79732
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  • 8
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    Sulfur dioxide and its variations (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: UV spectroscopy from the Pioneer Venus Orbiter shows a decline in the cloud top abundance of SO2 from about 100 ppb to about 10 ppb in the period 1978-1986. A consistent decline in polar haze has occurred over the same period with the correlation coefficient between these two observables of 0.8. Star calibrations determine the instrument sensitivity to within 10 percent, which rules out the possibility that this is an instrumental effect. Systematic errors could increase the SO2 abundance to twice the inferred values in later orbits. Tracking of SO2 features and power spectral analysis give rotation periods for the longer lived features of 3.6-5.2 d, consistent with cloud tracked winds observed at other wavelengths. The behavior of SO2 and polar haze can be plausibly explained by episodic injection of SO2 into the cloud top regions, for example, by active volcanism.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 9
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    Ion phase space densities in the Jovian magnetosphere (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The Voyager Low Energy Charged Particle ion data from the Jovian magnetosphere were analyzed to determine the phase-space densities of particles in the region between 5 and 80 Jupiter radii. Data from the Jovian current sheet crossings for locally mirroring particles were used. These are the first calculations of phase-space densities in the nondipolar field region containing the Jovian magnetodisk current sheet. The profiles are consistent with lossy inward radial transport and a source in the outer magnetosphere. The inferred loss rate in a radial diffusion model measuring how quickly particles are scattered out of the neutral sheet exceeds the usual strong diffusion loss rate.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 95; 20833-20
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  • 10
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    The impact cratering record on Triton (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Impact craters on Triton are scarce owing to the relatively recent resurfacing by icy melts. The most heavily cratered surface has a crater density about the same as the lunar maria. The transition diameter from simple to complex craters occurs at a diameter of about 11 kilometers, and the depth-diameter relationship is similar to that of other icy satellites when gravity is taken into account. The crater size-frequency distribution has a differential -3 slope (cumulative -2 slope) and is the same as that for the fresh crater population on Miranda. The most heavily cratered region is on the leading hemisphere in Triton's orbit. Triton may have a leading-trailing asymmetry in its crater population. Based primarily on the similarity of size distributions on Triton and Miranda and the relatively young surface on Triton, the source of Triton's craters is probably comets. The very peculiar size distribution of sharp craters on the 'cantaloupe' terrain and other evidence suggests thay are volcanic explosion craters.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science (ISSN 0036-8075); 250; 437-439
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