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  • Other Sources  (8)
  • 1985-1989  (8)
  • 1
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    Supporting planetary missions - The Space Station role (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Spacecraft destined for interplanetary flight can be assembled, fueled, and tested near the Space Station, thus providing for spacecraft too large and/or massive for launch from earth on a single boost. The 28.5-deg-inclination orbit of the Station will, however, cause penalties for some missions. Another Station role is to recover sample returns from, e.g., Mars or a comet.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AAS PAPER 85-475
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Scientific objectives for a 1996 Mars Sample Return Mission (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Mars Sample Return Mission, designed to return a variety of surface and subsurface samples as well as atmospheric samples, is described. Primary information about the planet is essential to understanding its place in the evolution of the solar system. The most accurate landing techniques will be used to place the lander near geologically interesting features. A capable rover will be an essential element of the sample collection strategy to maximize the diversity of the samples. The sample collection and return systems will keep the samples at Mars ambient conditions or colder to preserve the abundances and distribution of volatile components. Planetary quarantine is an important consideration for both the Mars lander and the earth return vehicle. Quarantine procedures must be consistent with the primary objectives of the mission and must not compromise the investigations of the returned samples.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AAS 84-158
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    NASA TECHNICAL REPORTS
  • 3
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    Flight results from the gravity-gradient-controlled RAE-1 satellite (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The in-orbit dynamics of a large, flexible spacecraft has been modeled with a computer simulation, which was used for designing the control system, developing a deployment and gravity-gradient capture procedure, predicting the steady-state behavior, and designing a series of dynamics experiments for the Radio Astronomy Explorer (RAE) satellite. This flexible body dynamics simulator permits three-dimensional, large-angle rotation of the total spacecraft and includes effects of orbit eccentricity, thermal bending, solar pressure, gravitational accelerations, and the damper system. Flight results are consistent with the simulator predictions and are presented for the deployment and capture phases, the steady-state mission, and the dynamics experiments.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 86-2140
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Sampling the cometary nucleus (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Three modes for obtaining samples of cometary material: remote sampling, hover mode sampling, and landed (anchored) sampling are discussed. For each mode, trade-offs involving complexity, risk factors, and cost must be analyzed for the spacecraft and the sampling system. Flyby results for comet Halley indicate heterogeneity in the cometary nucleus that could dictate sampling at several different locations. Coring drills, drive tubes, and specialized mantle sampling devices must operate at cold temperatures (100 to 180 K) without heating the sample. Sample selections must be accomodated by the sample return canister, which must also be protected from thermal excursions.
    Keywords: ASTROPHYSICS
    Type: ESA Proceedings of an ESA Workshop on the Comet Nucleus Sample Return Mission; p 211-216
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    NASA TECHNICAL REPORTS
  • 5
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    Software Comparison (1986)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Software Comparison Package (SCP) compares similar files. Normally, these are 90-character files produced by CDC UPDATE utility from program libraries that contain FORTRAN source code plus identifier. SCP also used to compare load maps, cross-reference outputs, and UPDATE corrections sets. Helps wherever line-by-line comparison of similarly structured files required.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: MSC-20777 , NASA Tech Briefs (ISSN 0145-319X); 9; 4; P. 176
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  • 6
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    Printer Graphics Package (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Printer Graphics Package (PGP) is tool for making two-dimensional symbolic plots on line printer. PGP created to support development of Heads-Up Display (HUD) simulation. Standard symbols defined with HUD in mind. Available symbols include circle, triangle, quadrangle, window, line, numbers, and text. Additional symbols easily added or built up from available symbols.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: MSC-20778 , NASA Tech Briefs (ISSN 0145-319X); 9; 4; P. 177
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    NASA TECHNICAL REPORTS
  • 7
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    Tektite-like bodies at Lonar Crater, India - Implications for the origin of tektites (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Homogeneous dense glass bodies (both irregular and splash form) with high silica contents (about 67 pct SiO2) occur in the vicinity of Lonar Crater, India. Their lack of microlites and mineral remnants and their uniform chemical composition virtually preclude a volcanic origin. They are similar to tektites reported in the literature. While such a close association of tektite-like bodies with impact craters is already known (Aouelloul Crater, Mauritania; Zhamanshin Crater, U.S.S.R.), the tektite-like bodies at Lonar Crater are unique in that they occur in an essentially basaltic terrain. Present geochemical data are consistent with these high silica glass bodies being impact melt products of two-thirds basalt and one-third local intertrappean sediment (chert). The tektite-like bodies of the impact craters Lonar, Zhamanshin, and Aouelloul are generally similar. Strong terrestrial geochemical signatures reflect the target rock REE patterns and abundance ratios and demonstrate their terrestrial origin resulting from meteorite impact, as has been suggested by earlier workers.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 92; E729-E73
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  • 8
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    Heterogeneous dissemination of projectile materials in the impact melts from Wabar crater, Saudi Arabia (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The initial observations of Spencer (1933) that two distinct impact melts coexist at the 90-m-diameter Wabar crater, Saudi Arabia, is confirmed. A dark or 'black' melt contains on the order of 4 percent meteoritic contamination, while the transparent or 'white' melt contains less than 1 percent. The Fe/Ni ratios in both varieties exhibit considerable scatter on electron-microprobe scales, akin to those reported by others for metal spherules in the black melt. If the meteoritic component is subtracted, both melts are chemically very similar. Clasts engulfed by the Wabar melts were investigated also, as they represent the progenitor lithologies from which the melts formed. Bulk compositions for these clasts reveal subtle differences in modal feldspar content within the quartz-rich Wabar target. Both melts require that a minimum of two target lithologies be present in the Wabar melt zone.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Science Conference; Mar 14, 1988 - Mar 18, 1988; Houston, TX; United States
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