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  • 1
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    Significance of absorption features in Io's IR reflectance spectrum (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: This paper shows that the presence of SO2 may have important implications for Io's atmosphere and transient phenomena. It is suggested that any abundant metal-containing compounds, such as halides or sulfides, are spectrally bland in the wavelength region from 2.0 to 5.0 microns.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 280; Aug. 30
    Format: text
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  • 2
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    A search for new features in the visible spectrum of Io (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The spectrum of Io between 4000 A and 6000 A has been studied at high resolution for new features. None were found. The upper limit to new emissions varies with wavelength from 13 kR to 49 kR.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Planetary and Space Science; 27; Feb. 197
    Format: text
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  • 3
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    The rotation of Uranus (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: The rotation rate of Uranus is investigated by measuring the tilts of reflected Fraunhofer lines observed through a slit spectrograph. The data obtained are corrected for the effect of astronomical seeing, and the data-reduction procedures are outlined in detail. Observations are discussed which indicate that the planet's pole of rotation is parallel to the pole of its satellites' orbits and that Uranus may not rotate as a solid body. A rotational period of 15.57 + or - 0.80 hr is derived for northern midlatitudes on Uranus by adopting a planetary diameter of 51,800 + or - 600 km. Possible sources of small systematic errors are briefly considered.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal; vol. 217
    Format: text
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  • 4
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    Comparison of dynamic crystallization techniques on Apollo 15 quartz normative basalts (1979)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The paper compares dynamic crystallization techniques used on Apollo 15 quartz normative basalts which show differences related to their method. The variation of pyroxene core major element chemistry with cooling rate is confirmed, and it is shown that the Fe loss from liquid is shifted toward the En-Di joint; it is suggested that the nucleation temperature and breakdown of equilibrium partitioning as a function of cooling rate dictate the core composition. It is concluded that the different crystallization behavior that results from the Fe-capsule and Fe-loop container methods is related to the nucleation kinetics.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 19, 1979 - Mar 23, 1979; Houston, TX
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  • 5
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    A geochemical and petrographic study of 1-2-mm fines from Apollo 17 (1975)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Samples of fines less than 1-mm and 155 1-2 mm particles from several Apollo 17 sites were analyzed for Na, Sc, Cr, Mn, Fe, Co, Ni, Hf, Ta, Th, and REE. Products of comminution and construction are present in the 1-2 mm particles, and the compositions of the rock fragments clearly indicate the general chemical characteristics of their parent rock types. The likely sources of materials for the glassy particles are considered. Glasses are enriched over their parent soils in Fe, Sc, Mn, and Cr, and are relatively enriched in light REE, so that some chemical fractionation accompanies glass-forming processes. Elements were determined by instrumental neutron activation analysis.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX
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  • 6
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    Drive tube 60009 - A chemical study of magnetic separates of size fractions from five strata (1976)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Each bulk soil and both the magnetic and nonmagnetic components of the 90-150 micron and below 20 micron fractions of five soils from drive tube 60009 were analyzed. Samples were analyzed for FeO, Na2O, Sc, Cr, Co, Ni, Hf, Ta, Th, La, Ce, Sm, Eu, Tb, Yb, and Lu by neutron activation analysis. Several samples were fused and analyzed for major elements by electron microprobe analysis. Compositional variations are not systematically related to depth. The compositions of the five soils studied are well explained by a two-component mixing model whose end members are a submature Apollo 16-type soil and an extremely immature anorthositic material similar to 60025. There is evidence that the anorthositic component had received a small amount of exposure before these soils were mixed. After mixing, the soils received little exposure suggesting mixing and deposition on a rapid time scale.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 15, 1976 - Mar 19, 1976; Houston, TX
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  • 7
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    Infrared images of Jupiter at 5-micrometer wavelength during the Voyager 1 encounter (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A coordinated program to observe Jupiter at high spatial resolution in the 5-micrometer wavelength region was undertaken to support Voyager 1 imaging and infrared radiation experiment targeting. Jupiter was observed over a 5-month period from Palomar and Mauna Kea observatories. The frequency of observations allowed the selection of interesting areas for closer Voyager examination and also provided good short-term monitoring of variations in cloud morphology. Significant global changes in the 5-micrometer distribution are seen over this time period.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 204; June 1
    Format: text
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  • 8
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    A model of Jupiter's sulfur nebula (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A simple model of Jupiter's S II emission nebula is developed on the basis of a complete treatment of electron-impact excitation of sulfur ions. Forbidden line emission from S II ions excited by electron collisions in the Jovian nebula is analyzed, and existing observations are interpreted using a simple model of an S II nebula which is uniform in depth. The results show that the depth of the nebula is 300,000 to 600,000 km, the electron density is about 3160 per cu cm, the electron temperature is approximately 25,000 K, and the S II concentration is roughly 79 ions per cu cm. It is noted that these plasma conditions are quite different from those reported for the same region on the basis of Pioneer 10 data, indicating that the S II nebula is a sporadic event. Io is suggested as the source of the sulfur.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal; 206; June 15
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  • 9
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    Measurements of S II optical emission from the thermal plasma of Jupiter (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Photometric spectra of the forbidden S II emission lines at 6716 and 6731 A originating in the Jovian magnetosphere are examined. The summed apparent emission rate in the two sulfur lines is plotted against the central-meridian longitude of Jupiter in System III. It is found that the total sulfur brightness exhibited a distinct minimum when the Jovian magnetic dipole was in the plane defined by the earth-Jupiter vector and the Jovian rotational axis. The observations are shown to be qualitatively consistent with an annular emitting region at the magnetic equator with a thickness of about 1 Jupiter radius and an inner radius of 4 to 5 Jupiter radii. The observations also imply a (logarithmic) characteristic electron density of approximately 3.7 per cu cm and a (logarithmic) average column abundance of about 11.5 per sq cm for singly ionized sulfur.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal; vol. 224
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  • 10
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    The persistence and size of thermal anomalies on Venus (1978)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Thermal maps of Venus on 16 days during a span of 43 days just before inferior conjunction were obtained during 1973-1974 and are described. The research represents a first step towards the goal of using ground-based observations to determine the time and space scales of dynamical events taking place in the Venus clouds. The described average limb darkening differs from that reported by Ingersoll and Orton (1974). Real day-to-day changes in limb darkening, one occasion of a 4-day repetition of a thermal anomaly, solar-related anomalies, and a southern hemisphere solar-related disturbance are discussed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 35; Aug. 197
    Format: text
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