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  • LUNAR AND PLANETARY EXPLORATION  (104)
  • 1980-1984
  • 1970-1974  (104)
  • 1965-1969
  • 1974  (104)
  • 1
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    Six-color photometry of Iapetus, Titan, Rhea, Dione and Tethys (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Six-color photometric observations made during Saturn's 1972/73 opposition enable us to separate the solar phase and orbital phase contributions to the observed light variations of Iapetus, Titan, Rhea, Dione and Tethys. Titan shows no orbital variations, but has phase coefficients which range from negligible values in the infrared to 0.014 mag/deg in the ultraviolet. Rhea has a bright leading side, a light curve amplitude of about 0.2 mag, and surprisingly large phase coefficients. Combined with other available information, the observations suggest a very porous, texturally complex surface layer. Dione has a leading side which is a few tenths of a magnitude brighter than the trailing side, but the light curve amplitude has little wavelength dependence and the phase coefficients are significantly smaller than those of Rhea, suggesting a less intricate surface texture. The leading side of Tethys is probably a few tenths of a magnitude brighter than the trailing side. Our Iapetus observations generally supplement the earlier work by Millis.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 23; Nov. 197
    Format: text
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  • 2
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    Surface electrical properties experiment, part 2 (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: For abstract, see N75-15570.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-141472
    Format: application/pdf
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  • 3
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    Surface electrical properties experiment, part 1 (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The work is reported which was performed on the Surface Electrical Properties Experiment Data Acquisition System. Areas discussed include: data handling and processing, installation and external signal application, operation of the equipment, and digital output. Detailed circuit descriptions are included.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-141471
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  • 4
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    Micrometeoroids and lunar rocks (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Description of present concepts of the lunar micrometeoroid flux as deduced from microcrater observations on lunar rocks and available laboratory simulations with smooth glassy surfaces. Results examined include factors governing microcrater morphology, size frequency distribution, and correlation of lunar rock surface exposure ages with absolute crater number densities.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 5
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    The micrometeoroid complex and evolution of the lunar regolith (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The interaction of the micrometeoroid complex with the lunar surface is evidenced by numerous glass-lined microcraters on virtually every lunar surface exposed to space. Such craters range in size from less than .1 micron to approximately 2 sq cm diameter. Using small scale laboratory cratering experiments for calibration, the observed crater-sized frequency distributions may be converted into micrometeoroid mass distributions. These lunar mass distributions are in essential agreement with satellite data. Some physical properties of micrometeoroids may be deduced by comparing lunar crater geometries with those obtained in laboratory experiments. The proponderance of circular outlines of lunar microcraters necessitates equidimensional, if not spherical, micrometeoroids.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-X-72191 , REPT-210 , Sov.-Am. Conf. on the Cosmochem. of the Moon and Planets,; Jun 04, 1974 - Jun 08, 1974; Moscow; Soviet Union
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  • 6
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    Elemental abundances in interplanetary dust (1974)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The paper reports on measurements taken of elemental abundances in two interplanetary dust grains. Meteoroidal residue found inside micrometeoritic craters was discovered by optically scanning the 800 sq cm aluminum surface of the S-228 transuranic cosmic-ray experiment exposed to space for 67d during the Skylab-IV mission. Crater analyses for two randomly sampled meteoroids showed a composition consistent with troilite in the 9 micron-minute particle. Chondritic abundances were found in the 30 micron-minute particle. Particles of similar size and chemistry were common in carbonaceous chondrite meteorites. The inferred grain sizes within the 30 micron-minute particle provided evidence for the similarity to carbonaceous chondrites rather than to other meteorite types.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 252; Dec
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  • 7
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    Four-color photometry of the Galilean satellites (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Photometry obtained in 1973 on the uvby system yields high-precision rotational light curves for Io, Europa, and Ganymede at a mean phase angle of about 6 deg. By combining our observations with photometry obtained by others over a broader range of phase angle, we also derive improved values for the phase coefficients and opposition surges of the four Galilean satellites. The values of V(1, 0) obtained by linear extrapolation to zero phase are accurate to + or - 0.03 magnitudes. We also derive the colors of the sun on the uvby system and use these to obtain albedos of the satellites in four colors.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 23; Nov. 197
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  • 8
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    Dekametric and hectometric observations of Jupiter from the RAE-1 satellite (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Analysis of RAE-1 satellite data has revealed the presence of radio bursts from Jupiter in the frequency range from 4700 kHz to 450 kHz. Variations in the activity with respect to the planet's system III longitude are presented at seven frequencies. A merge of ground-based and satellite-acquired data indicates that the long-sought-for peak in Jupiter's low-frequency flux spectrum occurs at about 8 MHz.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal; 194; Nov. 15
    Format: text
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  • 9
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    U-Th-Pb and Rb-Sr systematics of Apollo 17 boulder 7 from the North Massif of the Taurus-Littrow valley (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Portions of highland breccia boulder 7 collected during the Apollo 17 mission were studied using U-Th-Pb and Rb-Sr systematics. A Rb-Sr internal isochron age of 3.89 plus or minus 0.08 b.y. with an initial Sr-87/Sr-86 of 0.69926 plus or minus 0.00008 was obtained for clast 1 (77135,57) (a troctolitic microbreccia). A troctolitic portion of microbreccia clast 77215,37 yielded a U-Pb internal isochron of 3.8 plus or minus 0.2 b.y. and an initial Pb-206/Pb-207 of 0.69. These internal isochron ages are interpreted as reflecting metamorphic events, probably related to impacts, which reset Rb-Sr and U-Pb mineral systems of older rocks.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth and Planetary Science Letters; 23; 3, Oc; Oct. 197
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  • 10
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    Measurement of the lunar neutron density profile (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: An in situ measurement of the lunar neutron density from 20 to 400 g/sq cm depth between the lunar surface was made by the Apollo 17 Lunar Neutron Probe Experiment using particle tracks produced by the B10(n, alpha)Li7 reaction. Both the absolute magnitude and depth profile of the neutron density are in good agreement with past theoretical calculations. The effect of cadmium absorption on the neutron density and in the relative Sm149 to Gd157 capture rates obtained experimentally implies that the true lunar Gd157 capture rate is about one half of that calculated theoretically.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-141782 , CONTRIB-2539
    Format: application/pdf
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