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  • Other Sources  (12)
  • SPACE TRANSPORTATION  (7)
  • ASTROPHYSICS  (5)
  • METEOROLOGY AND CLIMATOLOGY
  • 1990-1994  (12)
  • 1991  (12)
  • 1
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    The peculiar velocity field predicted from the distribution of IRAS galaxies (1991)
    In:  CASI
    Details
    Publication Date: 2006-06-13
    Description: It is noted, in the wake of the recent completion of a redshift survey of about 2300 IRAS galaxies with a characteristic depth of about 4000 km/sec, that the redshift distribution obtained is entirely consistent with that of the observed optical galaxies in the direction of the Great Attractor. The IRAS velocity field also qualitatively reproduces recent observations of the spiral and elliptical galaxies. Although it is not possible to rule out the existence of excess mass in the galactic plane in the direction of the Great Attractor, this is not needed to explain the observed peculiar velocities.
    Keywords: ASTROPHYSICS
    Type: NAS-NRC, High-Energy Astrophysics. American and Soviet Perspectives; p 356-367
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A redshift survey of IRAS galaxies. III - Reconstruction of the velocity and density fields in N-body model universes (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: N-body simulations of a 'cold dark matter' universe are presently used to calibrate the accuracy, and assess the limitations, of the procedure previously employed to predict the velocity field within 8000 km/sec of the Local Group through the application of linear gravitational theory to a full-sky, flux-limited sample of IRAS galaxies. The rms difference between the one-dimensional acceleration and velocity of field particles is an increasing function of local density; linear theory can in this way account for all but one-sixth of kinetic energy. A series of artificial IRAS catalogs closely matching the real sample in space density and clustering amplitude is constructed. Velocity correlation functions are used to demonstrate that the predicted velocity fields are in good agreement with the true velocity fields on large scales.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 372; 394-409
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Understanding asteroid collisional history through experimental and numerical studies (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Asteroids can lose angular momentum due to so called splash effect, the analog to the drain effect for cratering impacts. Numerical code with the splash effect incorporated was applied to study the simultaneous evolution of asteroid sized and spins. Results are presented on the spin changes of asteroids due to various physical effects that are incorporated in the described model. The goal was to understand the interplay between the evolution of sizes and spins over a wide and plausible range of model parameters. A single starting population was used both for size distribution and the spin distribution of asteroids and the changes in the spins were calculated over solar system history for different model parameters. It is shown that there is a strong coupling between the size and spin evolution, that the observed relative spindown of asteroids approximately 100 km diameter is likely to be the result of the angular momentum splash effect.
    Keywords: ASTROPHYSICS
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990; p 399-402
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Debris/Ice/TPS Assessment and Photographic Analysis for Shuttle Mission STS-38 (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A debris/ice/TPS assessment and photographic analysis was conducted for the Space Shuttle Mission STS-38. Debris inspection of the flight elements and launch pad were performed before and after launch. Ice/frost conditions on the external tank were assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography was analyzed after launch to identify ice/debris sources and evaluate potential vehicle damage and/or in-flight anomalies. The debris/ice/TPS conditions and photographic analysis of Mission STS-38, and their overall effect on the Space Shuttle Program are documented.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-103815 , NAS 1.15:103815
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  • 5
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    Debris/ice/TPS assessment and photographic analysis of shuttle mission STS-48 (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A Debris/Ice/TPS assessment and photographic analysis was conducted for Space Shuttle Mission STS-48. Debris inspection of the flight elements and launch pad were performed before and after launch. Ice/frost conditions on the External Tank were assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography was analyzed after launch to identify ice/debris sources and evaluate potential vehicle damage and/or in-flight anomalies. The debris/ice/TPS conditions and photographic analysis of Mission STS-48 are documented, along with their overall effect on the Space Shuttle Program.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-103826 , NAS 1.15:103826
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    NASA TECHNICAL REPORTS
  • 6
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    Debris/Ice/TPS Assessment and Photographic Analysis for Shuttle Mission STS-40 (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A debris, ice, Thermal Protection System (TPS) assessment and photographic analysis for Space Shuttle Mission STS-40 was conducted. Debris inspections of the flight elements and launch pad were performed before and after launch. Ice and frost conditions on the External Tank were assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle, followed by on-pad visual inspection. High speed photography was analyzed after launch to identify ice and debris sources and to evaluate potential vehicle damage and/or in-flight anomalies.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-103822 , NAS 1.15:103822
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    NASA TECHNICAL REPORTS
  • 7
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    Debris/ice/TPS assessment and photographic analysis for shuttle mission STS-35 (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A debris/ice/Thermal Protection System (TPS) assessment and photographic analysis was conducted for Space Shuttle Mission STS-35. Debris inspections of the flight elements and launch pad were performed before and after the launch. Ice/frost conditions on the External Tank were assessed by the use of computer programs, monographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography was analyzed after launch to identify ice/debris sources and evaluate potential vehicle damage and/or in-flight anomalies. Documented here are the debris/ice/TPS conditions and photographic analysis of Mission STS-35, and the overall effect of these conditions on the Space Shuttle Program.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-103816 , NAS 1.15:103816
    Format: application/pdf
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  • 8
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    Accretion and evolution of solar system bodies (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: We use a combination of analytical and numerical methods to study dynamical processes involved in the formation of planets and smaller bodies in the solar system. Our goal was to identify and understand critical processes and to link them in a numerical model of planetesimal accretion. We study effects of these processes by applying them in the context of the standard model of solar system formation, which involves accretion of the terrestrial planets and cores of the giant planet from small planetesimals. The principal focus of our research effort is the numerical simulation of accretion of a swarm of planetesimals into bodies of planetary size. Our computer code uses a Monte Carlo method to determine collisional interactions within the swarm. These interactions are not determined simply by a relative velocity, but rather by explicit distributions of keplerian orbital elements. The planetesimal swarm is divided into a number of zones in semimajor axis, which are allowed to interact. The present version of our code has the capability of following detailed distributions of size, eccentricity, and inclination in each zone.
    Keywords: ASTROPHYSICS
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1990; p 433-435
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    NASA TECHNICAL REPORTS
  • 9
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    Debris/ice/TPS assessment and photographic analysis for Shuttle Mission STS-43 (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A debris/ice Thermal Protection System (TPS) assessment and photographic analysis was conducted for Space Station Mission STS-43. Debris inspections of the flight elements and launch pad were performed before and after launch. Ice/frost conditions on the External Tank (ET) were assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography was analyzed after launch to identify ice/debris sources and to evaluate potential vehicle damage and/or in-flight anomalies.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-103823 , NAS 1.15:103823
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Debris/Ice/TPS Assessment and Photographic Analysis for Shuttle Mission STS-37 (1991)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A Debris/Ice/TPS assessment and photographic analysis was conducted for Space Shuttle Mission STS-37. Debris inspections of the flight elements and launch pad were performed before and after launch. Ice/frost conditions on the External Tank were assessed by the use of computer programs, nomographs, and infrared scanner data during cryogenic loading of the vehicle followed by on-pad visual inspection. High speed photography of launch was analyzed to identify ice/debris sources and evaluate potential vehicle damage and/or inflight anomalies. The debris/ice/TPS conditions and photographic analysis of Mission STS-37 are documented, along with their overall effect on the Space Shuttle Program.
    Keywords: SPACE TRANSPORTATION
    Type: NASA-TM-103818 , NAS 1.15:103818
    Format: application/pdf
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