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  • 1
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    Yes, Kakangari is a unique chondrite (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The position of the Kakangari chondrite as the representative of a new class of chondrites is considered, taking into account the results of the analysis of a 17.1-mg piece of Kakangari for 20 elements. Elemental concentration data are compared for Kakangari and other meteorite groups. Data for the most similar groups, C2, C3(V), L, and E4 chondrites are represented in a graph along with Kakangari data. It is found that pronounced differences exist between Kakangari and the other meteorite classes.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 265; Jan. 20
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Satellite-sized planetesimals and lunar origin (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Exploratory calculations using accretionary theory are made to demonstrate plausible sizes of second-largest, third-largest, etc., bodies at the close of planet formation in heliocentric orbits near the planets, assuming asteroid-like size distributions at the start of the calculation. Many satellite-sized bodies are found to be available for capture, cratering, or collisional fragmentation. In the case of earth-sized planets, the models suggest second-largest bodies of 500 to 3000 km radius, and tens of bodies larger than 100 km radius. Many of these interact with the planet before suffering any fragmentation events with each other. Collision of a large body with earth could eject iron-deficient crust and upper mantle material, forming a cloud of refractory, volatile-poor dust that could form the moon. Other satellite systems may have been affected by major capture or collision events of chance character.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Format: text
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  • 3
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    Long-range aspects of a large scale space program (1976)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar Science Inst., Abstracts of Papers Presented at a Special Session of the Seventh Annual Lunar Science Conference on Utilization of Lunar Materials and Expertise for Large Scale Operations in Space; p 10-25
    Format: application/pdf
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  • 4
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    Trace elements in the Allende meteorite. IV - Amoeboid olivine aggregates (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: INAA data for Ca, Sc, Hf, La, Ce, Sm, Eu, Tb, Yb, Lu, Os, Ir, Ru, Na, Cl, Br, Fe, Mn, Cr, Co, Au, As, and Sb are presented for ten amoeboid aggregates from the Allende meteorite. Only one lacks olivine. Seven of the remainder, as a group, have cosmic proportions of refractory lithophile and siderophile elements and appear to have formed when coarse-grained Allende inclusion material underwent partial reaction with a low-temperature nebular gas and mixture with FeO-rich olivine. The other two have highly fractionated abundances of refractory elements relative to one another compared to Cl chondrites, including Group II REE patterns, and probably formed by the mixing of fine-grained Allende inclusion material with FeO-rich olivine. Non-refractory siderophile components are also different in composition in each type of amoeboid olivine aggregate.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 43; June 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Pontlyfni - A differentiated meteorite related to the group IAB irons (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The abundances of 23 major and trace elements in the Pontlyfni meteorite have been measured by instrumental neutron activation analysis. The compositions of the metal and silicate fractions suggest a genetic relationship between Pontlyfni and the group IAB irons.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth and Planetary Science Letters; 35; 1, Ma; May 1977
    Format: text
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  • 6
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    Mars - Satellite origin and angular momentum (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The origin of Phobos and Deimos is considered with a view to accounting for the existence of very small satellites with circular orbits in the Martian equatorial plane, and simultaneously for the suspected angular momentum deficiency of the Mars system. All models considered failed to satisfy at least one requirement, and the problem is considered more puzzling than is at first apparent. The Martian angular momentum deficiency, if physically significant, may be unrelated to the present satellites' origin, but might relate to a large ancient satellite, long ago destroyed. Accretion onto Mars of large amounts of asteroidal dust brought in by Poynting-Robertson drag may have some bearing on the angular momentum problem.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 7
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    Trace elements in the Allende meteorite. III - Coarse-grained inclusions revisited (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Radiochemical neutron activation analytic determinations of several elements in coarse-grained inclusions of the Allende meteorite are reported. The condensation and fractionation behavior of these and other elements are described. Evidence was found for a post-accretion thermal event which redistributed some trace elements. The solar system ratio of Zr/Hf is computed on the basis of the minimum variation in the inclusion, and the percentage of high-temperature condensates in the earth and moon are calculated on the basis of the mean U content of the inclusions. The mean value of the enrichment factors of 21 refractory elements relative to C1 chondrites is provided, and the elements that did or did not condense in a solid solution of melilite are listed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta; 41; Nov. 197
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  • 8
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    Asteroid collisional evolution - Evidence for a much larger early population (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The present population of asteroids is a remnant of a vastly larger one that contained perhaps a planetary mass, dominantly distributed in planetesimals approximately 500 kilometers or less in diameter. It constituted a large reservoir of objects that plausibly were responsible for cratering the moon, Mars, and Mercury. Much asteroidal dust may have accumulated on Mars and other planets.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 190; Nov. 7
    Format: text
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  • 9
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    Error analysis of penetrator impacts on bodies without atmospheres (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Penetrators are missile shaped objects designed to implant electronic instrumentation in various of surface materials with a nominal impact speed around 150 m/sec. An interest in the application of this concept to in situ subsurface studies of extra terrestrial bodies and planetary satellites exists. Since many of these objects do not have atmospheres, the feasibility of successfully guiding penetrators to the required near-zero angle-of-attack impact conditions in the absence of an atmosphere was analyzed. Two potential targets were included, i.e., the moon and Mercury and several different penetrator deployment modes were involved. Impact errors arising from open-loop and closed-loop deployment control systems were given particular attention. Successful penetrator implacement requires: (1) that the impact speed be controlled, nominally to 150 m/sec, (2) that the angle of attack be in range 0 deg - 11 deg at impact, and (3) that the impact flight path angle be with 15 deg of vertical.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-146397 , SAI-1-120-194-T3
    Format: application/pdf
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  • 10
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    Jupiter's magnetic field, magnetosphere, and interaction with the solar wind - Pioneer 11 (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Measurements of the magnetic field vector were obtained continuously throughout the encounter of the spacecraft with the planet Jupiter. Effects of Jupiter on the solar wind are considered along with the characteristics of the magnetopause at both low and intermediate latitudes, the three basic regions within the magnetosphere, and a spherical harmonic analysis of the Pioneer 11 measurements. The spherical harmonic representation has been used to derive contours of the magnetic field strength at the surface of Jupiter.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 188; May 2
    Format: text
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