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  • LUNAR AND PLANETARY EXPLORATION  (14,409)
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  • 1
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    /Ar-39/-/Ar-40/ ages of lunar rocks (1977)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The (Ar-39)-(Ar-40) ages for 21 lunar samples from Apollo 14, 15, 16, and 17 are presented. The cosmic-ray exposure ages, Ca, and K contents are also measured. Mare basalt 15075, a slowly cooled pyroxene-phyric basalt, has a (Ar-39)-(Ar-40) plateau age of 3.45 + or - 0.2 billion years. This is one of the oldest mare basalts found at Apollo 15. 65777, a recrystallized noritic breccia, has a plateau age of 3.72 + or - 0.02 billion years, relatively young for a highland rock. This rock is probably related to a cratering event over 200 m.y. post Imbrium. Similarly breccia 68516 was formed 150 m.y. post Imbrium. Histograms for the (Ar-39)-(Ar-40) plateau ages strongly suggest that the peak in ages at Apollo 14, 16, and 17 of about 4 billion years is caused by the dominance of Imbrium ejecta at these landing sites.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 14, 1977 - Mar 18, 1977; Houston, TX
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    NASA TECHNICAL REPORTS
  • 2
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    /Ar-40/-/Ar-39/ dating of Apollo 16 and 17 rocks (1975)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The reported study is a continuation of an investigation begun by Alexander and Kahl (1974), with primary emphasis on (Ar-40)-(Ar-39) dating of lunar breccias. A primary objective of the study was related to the resolution of small plateau-age differences between Apollo 16 and 17 samples which have been irradiated in the same irradiation. This objective was not realized because (1) neither of the considered Apollo 16 samples has a well-defined plateau, and (2) the release patterns of the two Apollo 17 samples with plateaux (73235 and 77017) are sufficiently complex to suggest caution in interpretation of fine-scale differences among apparent ages. The plateau age of 73235 agrees well with plateau ages measured for a nearby boulder at the South Massif. The plateau age of 77017, on the other hand, agrees well with plateau ages measured in an nearby boulder at the base of the North Massif. These rock and boulder ages are tightly clustered about 3.99 b.y., and this clustering suggests that the North and South Massifs were made in the same basin-forming event, presumably Serenitatis.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 17, 1975 - Mar 21, 1975; Houston, TX
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    NASA TECHNICAL REPORTS
  • 3
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    /Ar-40/-/Ar-39/ dating of inclusions from IAB iron meteorites (1979)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 43; Nov. 197
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  • 4
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    12054 and 76215 - New measurements of interplanetary dust and solar flare fluxes (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The mass distribution and flux of micrometeoroids, variations in solar activity, solar-wind erosion and solar-flare track production are discussed on the basis of lunar sample analyses. A bimodal size frequency distribution of micrometeorites is found; the ratio of the density of craters larger than 0.1 micron to the density of those larger than 500 microns is 50 to 100 million. Solar cosmic-ray track ages determined for the lunar samples through use of the model of Blanford et al. (1975) indicate no variation in solar activity over a period of 2 million years. Solar wind erosion is set at no more than 0.03 A per year.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Conference; Mar 14, 1977 - Mar 18, 1977; Houston, TX
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  • 5
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    1580 Betulia - An unusual asteroid with an extraordinary lightcurve (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: Results of UBV photometry and polarimetry of 1580 Betulia during its 1976 apparition are presented. The synodic period of rotation is found to be 6.130 hr. The linear phase coefficient and absolute magnitude of the primary maximum in V are 0.032 mag/deg and 14.88, respectively. No color variations with rotation or solar phase angle were detected, the mean colors being B-V = 0.66 and U-B = 0.24. Betulia's light curve is unique among asteroids studied to date in that it displays three maxima and three minima within one rotational cycle, indicative of a region of greater roughness and/or a dark spot on one of its broad faces. Polarization results indicate a low albedo and a mean diameter of about 7 km, establishing Betulia as the first C-type asteroid to be found among the Mars crossers. A model accounting for most features of Betulia's light curve is given by a prolate spheroid rotating about one of its shorter axes having an axis ratio of 1:1.21 with a major topographic feature on one of its broad faces.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 35; Sept
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  • 6
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    16-30 micron spectroscopy of Titan (1980)
    In:  Other Sources
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    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
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  • 7
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    17-25 micrometer spectra of Jupiter and Saturn (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Ground-based spectra of Jupiter and Saturn in the region from 17 to 25 microns are compared with intensities computed from current thermal-structure models. Good agreement with the continuum of Jupiter is obtained for models which incorporate a temperature inversion, but published models give disagreement with the continuum of Saturn. Upper-limit abundances for sulfur and phosphorus in the Jovian atmosphere, as thermodynamically stable species S8 and P4, are found to be 0.04 and 2.1 times the solar abundance, respectively.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal; vol. 213
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  • 8
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    18 MHz interferometry of Non-Io-C L-bursts (1987)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: In order to investigate previous discrepancies in source size measurements, 18-MHz interferometric data of L-bursts from a Non-Io-C storm have been collected during the summer of 1986. Variations noted in the fringe visibility of the Jovian L-bursts indicate that the source size changes in time and that the emission region can sometimes be resolved with a relatively modest baseline. The results suggest that all Jovian source sizes are smaller than 10 arcsec (and are possibly smaller than 0.1 arcmin) and that it is more probable that L-burst emission during a Jovian storm will evolve into S-bursts than that S-bursts will become L-bursts.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 9
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    1973 dust storm on Mars - Maps from hourly photographs (1976)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 29; Nov. 197
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  • 10
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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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