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  • Other Sources  (5)
  • SPACE SCIENCES  (5)
  • E31
  • Astronomy
  • J24
  • 1970-1974  (5)
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  • Other Sources  (5)
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  • 1
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    Minimum impulse three-body trajectories. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A rapid and accurate method of calculating optimal impulsive transfers in the restricted problem of three bodies has been developed. The technique combines a multi-conic method of trajectory integration with primer vector theory and an accelerated gradient method of trajectory optimization. A unique feature is that the state transition matrix and the primer vector are found analytical without additional integrations or differentiations. The method has been applied to the determination of optimal two and three impulse transfers between the L2 libration point and circular orbits about both the earth and the moon.
    Keywords: SPACE SCIENCES
    Type: AIAA PAPER 73-145 , Aerospace Sciences Meeting; Jan 10, 1973 - Jan 12, 1973; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Nuclear microprobe analysis of solar proton implantation profiles in lunar rock surfaces (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Discussion of the results of hydrogen (proton) depth profile concentration analyses conducted on selected Apollo 16 rocks. A modeling of solar particle implantation profiles in lunar rocks is shown to trace the evolvement of these profiles under the combined influence of diffusion of atomic particles implanted in the rock, and rock surface erosion. It is also demonstrated that such diffusion may have a significant effect on the shape of the implantation profiles in certain rock materials.
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Mar 05, 1973 - Mar 08, 1973; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Radioactivities vs. depth in Apollo 16 and 17 soil (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The radioactivities of Ar-37, Ar-39, and H-3 measured at a number of depths for Apollo 16 and 17 soil are reported. The Ar-37 activities vs depth in the Apollo 16 drill string increased with depth and reached a broad maximum in the neighborhood of 50 g per sq cm before decreasing. The Ar-39 activities in Apollo 17 soil were higher than in Apollo 16 soil, probably owing to the higher Fe and Ti contents. The H-3 activities in Apollo 16 and 17 soil were quite similar and indicate that the 4 August 1972 flare produced very little H-3 compared to the amount produced by solar flares during the previous 50 years.
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Mar 05, 1973 - Mar 08, 1973; Houston, TX
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Error analysis of multi-conic techniques (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A general error analysis of three recently developed multi-conic methods of three-body trajectory integration has been carried out. Single-step error functions for position and velocity have been derived as Taylor series in powers of the time step and also in integral form. These error functions are used to investigate the relative accuracy of the three methods in various regions of the earth-moon space and to provide a method of variable step size control for the trajectory integration procedure. Numerical results are used to compare the multi-step performance of the methods for both large and small step sizes.
    Keywords: SPACE SCIENCES
    Type: AAS PAPER 73-217 , Astrodynamics Conference; Jul 16, 1973 - Jul 18, 1973; Vail, CO; US
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Radioactivities in returned lunar materials. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The difference between the Ar-37 activities from similar locations in the rocks 12002 and 15555 provides direct measures of the Ar-37 activities produced by the 2 November 1969 flare. Differences between the Ar-37 activities in 14321 and 15555 give Ar-37 activities produced by the 24 January 1971 flare. The intensities of the two flares were determined by making use of measured Ar-37 cross sections in simulated lunar material. The depth dependence of tritium in samples and its temperature-release pattern provides information about the sources of the tritium and about the intensity of solar flares integrated over the past 30 years.
    Keywords: SPACE SCIENCES
    Type: Lunar Science Conference; Jan 10, 1972 - Jan 13, 1972; Houston, TX
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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