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  • ASTROPHYSICS  (3)
  • STRUCTURAL MECHANICS  (1)
  • 1
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    Mass input into and output from the meteoritic complex (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The consequences which arise from the mutual collisions occurring between interplanetary meteoroids, the Poynting-Robertson (PR) effect and the radiation pressure ejection of small meteoroids are examined. The size distribution and flux of micrometeoroids at 1 AU are derived and the dependence of spatial density on distance from the sun is established. The following conclusions are made: (1) the lifetimes of meteoroids with masses approximately greater than 0.00001 g are dominated by catastrophic collisions; (2) after bering crushed by collisions, 70 to 85 percent of this mass will be in the form of zodiacal light particles (with masses in the range of 10 to the -10th g to 10 to the -5th g) which will in part be transported by the PR effect towards the sun where they will evaporate; (3) the 15 to 30 percent of the collisional fragments which have masses approximately less than 10 to the -10th g will, for the most part, be injected into hyperbolic orbits by radiation pressure.
    Keywords: ASTROPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Investigation of interplanetary dust from out-of-ecliptic space probes (1976)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Measurements of interplanetary dust via zodiacal light observations and direct detection are discussed for an out-of-ecliptic space probe. Particle fluxes and zodiacal light brightnesses were predicted for three models of the dust distribution. These models predict that most of the information will be obtained at space probe distances less than 1 A.U. from the ecliptic plane. Joint interpretation of the direct particle measurements and the zodiacal light data can yield the best knowledge of the three-dimensional particle dynamics, spatial distribution, and physical characteristics of the interplanetary dust. Such measurements are important for an understanding of the origin and role of the dust in relation to meteoroids, asteroids, and comets, as well as the interaction of the dust with solar forces.
    Keywords: ASTROPHYSICS
    Type: Proc. of the Symp. on the Study of the Sun and Interplanetary Medium in Three Dimensions; p 298-320
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    NASA TECHNICAL REPORTS
  • 3
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    ATTITUDE DETERMINATION FROM SPECULAR AND DIFFUSE REFLECTION BY CYLINDRICAL ARTIFICIAL SATELLITES (1963)
    In:  CASI
    Details
    Publication Date: 2019-05-11
    Description: Attitude determination from specular & diffuse reflection by cylindrical satellites
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-52254 , SA0 SPECIAL REPT.-127
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Optical probing of comet Halley from the Giotto spacecraft (1986)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: The Halley optical probe experiment (HOPE) aboard the Giotto spacecraft has provided the first measurements of the optical properties of the dust and of some gaseous species (CN, C2, CO/+/ and OH) from inside the coma of comet Halley. The dust spatial distribution, inferred from sunlight scattering, obeys an r exp -2 law for distances from the nucleus r greater than about 2,000 km. The more rapid increase of dust density with distance observed in the innermost coma probably reflects the presence of a jet, or a surge of activity within a few hours before closest approach. The CN and OH signals increase more slowly than the dust signals, but faster than predicted by a simple model (of solar-excited resonance fluorescence) for the distribution of these species. This effect is probably caused in part by the dust contribution, as well as by the production from parent molecules of OH and CN in an excited state.
    Keywords: ASTROPHYSICS
    Type: Nature (ISSN 0028-0836); 321; 341-344
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    NASA TECHNICAL REPORTS
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