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  • Other Sources  (5)
  • ASTROPHYSICS  (3)
  • ASTRONAUTICS (GENERAL)  (2)
  • 1985-1989  (5)
  • 1987  (5)
  • 1
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    Impact and cratering processes on asteroids, satellites, and planets (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A new model for scaling the outcome of catastrophic collisions from laboratory scale experiments was developed and applied to large bodies where gravitational binding is dominant. This algorithm includes a pressure dependent impact strength which predicts that large asteroids behave as intrinsically strong objects due to compressive loading of overburden throughout their interiors. For small bodies, where the gravitational loading is negligible, this model assumes that the impact strength is independent of size. There was considerable discussion of scaling laws for disruption when these results were presented to one authors colleagues. The pressure strengthening impact strength model was viewed as physically quite plausible; however, it was argued that the impact strength should decrease with increasing size in the size range where gravitational compression is negligible.
    Keywords: ASTROPHYSICS
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 399-401
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Collisional and dynamical processes in moon and planet formation (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Research on a variety of dynamical processes relevant to the formation of planets, satellites and ring systems is discussed. The main focus is on studies of accretionary formation of early protoplanets using a numerical model, structures and evolution of ring systems and individual bodies within planetary rings, and theories of lunar origin.
    Keywords: ASTROPHYSICS
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 112-114
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Galilean satellite tour orbit determination assessment (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Results are given which demonstrate the ability of the orbit determination system to satisfy accuracy requirements in support of the Galileo Project's planned tour of Jupiter's satellites. The results are derived through the application of mission operation strategies and assumptions. It is shown that the achievement of the requisite orbit determination accuracies is predicated on the availability of optical navigation data. It is further demonstrated that the unavailability of tour optical navigation data yields not only degraded orbit determination accuracies which fail to meet propellant budget and science instrument pointing requirements, but also produces, for the planned 200 km flyby of Europa, an approximate 0.02 risk of having the spacecraft collide with the satellite.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 87-0095
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The use of database management systems and artificial intelligence in automating the planning of optical navigation pictures (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The use of database management systems (DBMS) and AI to minimize human involvement in the planning of optical navigation pictures for interplanetary space probes is discussed, with application to the Galileo mission. Parameters characterizing the desirability of candidate pictures, and the program generating them, are described. How these parameters automatically build picture records in a database, and the definition of the database structure, are then discussed. The various rules, priorities, and constraints used in selecting pictures are also described. An example is provided of an expert system, written in Prolog, for automatically performing the selection process.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 87-2400
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Research in particles and fields (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The astrophysical aspects of cosmic rays and gamma rays and the radiation and electromagnetic field environment of the Earth and other planets are investigated. These investigations are carried out by means of energetic particle and photon detector systems flown on spacecraft and balloons. Particle astrophysics is directed toward the investigation of galactic, solar, interplanetary, and planetary energetic particles and plasmas. The emphasis is on precision measurements with high resolution in charge, mass, and energy. Gamma ray research is directed toward the investigation of galactic, extragalactic, and solar gamma rays with spectrometers of high angular resolution and moderate energy resolution carried on spacecraft and balloons.
    Keywords: ASTROPHYSICS
    Type: NASA-CR-180173 , NAS 1.26:180173
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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