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  • LUNAR AND PLANETARY EXPLORATION  (668)
  • 1980-1984  (668)
  • 1980  (668)
  • 1
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    16-30 micron spectroscopy of Titan (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Titan has been observed from 16 to 30 micron with a resolution of 1 micron. Earlier broad-band data are consistent with the new measurements, which show that the disk integrated flux is nearly constant over the observed range of wavelengths. Limits on the CH4, H2, and N2 column densities and pressures at the bottom of the upper layer are derived. These indicate that if the atmosphere gas is CH4, an H2-CH4 mix, or N2, the inversion layer must be at pressures less than 30 millibars.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal; vol. 236
    Format: text
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  • 2
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    1979J2 - Discovery of a previously unknown Jovian satellite (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Detailed examination of imaging data of Jupiter taken by Voyager 1 reveals a previously unknown satellite 1979J2. Analysis of the image on the Jovian disk indicates that it is not an atmospheric feature or the shadow of any known satellite. The orbital period is calculated at 16 hours 11 minutes 21.25 seconds + or - 0.5 second and the semimajor axis is 3.1054 Jupiter radii. The observed profile is roughly circular with a diameter of 80 kilometers. An albedo of approximately 0.05 is reported, which is similar to Amalthea's. The geometry of the observational situation is illustrated.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 210; Nov. 14
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  • 3
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    21 cm maps of Jupiter's radiation belts from all rotational aspects (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Two-dimensional maps of the radio emission from Jupiter were made in December 1977 at a frequency of 1,412 MHz using the Westerbork telescope. Pictures in all four Stokes parameters have been obtained every 15 deg in longitude, each smeared over 15 deg of the planet's rotation. The maps have an E-W resolution of about 1/3 of the diameter of the disk and a N-S resolution 3 times less. The total intensity and linear polarization maps are accurate to 0.5% and the circularly polarized maps to 0.1% of the maximum intensities in I. The whole set of maps clearly shows the existence of higher order terms in the magnetic field of Jupiter.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astronomy and Astrophysics; 88; 1-2,; Aug. 198
    Format: text
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  • 4
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    A 3.6-b.y.-old impact-melt rock fragment in the Plainview chondrite - Implications for the age of the H-group chondrite parent body regolith formation (1980)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth and Planetary Science Letters; 51; 2, De; Dec. 198
    Format: text
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  • 5
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    A brief review of the evidence for solar variability on the planets (1980)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: An outline of the most recent and complete reviews on the history of Martian climate is presented and compared to the history of terrestrial climate. Suggestions are made on how solar luminosity changes may have affected both planets. Observations of the albedo of Titan occurring over a solar cycle are discussed, and the solar mechanisms that might be responsible for the observed albedo changes are considered.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Conference on The ancient sun: Fossil record in the earth, moon and meteorites; Oct 16, 1979 - Oct 19, 1979; Boulder, CO
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  • 6
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    A color-ratio map of Mercury (1980)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Orange and UV frames are used to construct a color-ratio map of the portion of Mercury imaged by Mariner 10, with at least two independent color-ratio images being used for each region in order to prevent spurious, blemish-induced color. Color differences appear to be smaller than those of the moon, and many apparently fresh craters and their ray systems tend to be bluer than their surroundings. Regions of interesting color contrast are noted, and it is concluded that there is little evident correlation of color with either geology or topography.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 17, 1980 - Mar 21, 1980; Houston, TX
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  • 7
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    A comparison of fractionation trends in the lunar crust and the Stillwater complex (1980)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Trends analogous to those of lunar highland samples are found in a plot of Mg/(Mg+Fe) in mafic minerals against the anorthosite content of coexisting plagioclase for the Stillwater complex. By applying the model derived from such data to lunar highland rocks, major element variations in the 'ferroan anorthosite' suite can be explained. It is concluded that the anorthositic suite may represent the original lunar crust, whereas the Mg-rich suite may have been derived from later high level intrusions.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Conference on the Lunar Highlands Crust; Nov 14, 1979 - Nov 16, 1979; Houston, TX
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  • 8
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    A comparison of secondary craters on the moon, Mercury, and Mars (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The present investigation is concerned with the distribution of secondary crater sizes and shapes and the relation of these distributions to inferred Martian lithology and ballistic history. Differences in secondary-crater size/range distributions around unmodified craters can be attributed to differences in gravitational potential, lithologic properties, and atmospheric interactions. Wide variations found in secondary crater populations around medium-size (5-50 km) Martian craters can be interpreted as effects of contrasting target lithologies. Extensive secondary cratering and elongate secondaries of Crater I in Chryse Planitia are consistent with a competent lithology of basaltic plains, as inferred from various photogeologic studies. The relatively few large secondaries around Arandas, and their high circularity, are consistent with a lithology exhibiting low yield strength, as inferred for the fractured plains.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 17, 1980 - Mar 21, 1980; Houston, TX
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  • 9
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    A fast, exact code for scattered thermal radiation compared with a two-stream approximation (1980)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: A two-stream accuracy study for internally (thermal) driven problems is presented by comparison with a recently developed 'exact' adding/doubling method. The resulting errors in external (or boundary) radiative intensity and flux are usually larger than those for the externally driven problems and vary substantially with the radiative parameters. Error predictions for a specific problem are difficult. An unexpected result is that the exact method is computationally as fast as the two-stream approximation for nonisothermal media.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 43; July 198
    Format: text
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  • 10
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    A first roadmap for kryptology (1980)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: Studies of the complex variations of the isotopic composition of xenon in the solar system have been christened 'xenology'. In the title of the present investigation, the word 'kryptology' is employed to indicate the primary objective of the reported studies. This objective is related to the prediction of the isotopic composition of krypton which comes from a number of specific locations of a supernova in association with the isotopic compositions of xenon from these locations. Krypton is a logical candidate for testing the stellar theory on geochemical grounds, taking into account also the point of view of nucleosynthesis, because the isotopes of xenon and krypton are formed by the same thermonuclear processes in stars. The data and arguments presented in the investigation show that the treatment by Heymann and Dziczkaniec (1979), although not wrong, is too simplistic, because it has ignored the possibility of holdup and arrest in Xe network.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Science Conference; Mar 17, 1980 - Mar 21, 1980; Houston, TX
    Format: text
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