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  • 1
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    Optimum two-impulse transfers for preliminary interplanetary trajectory design (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A method for numerically determining the optimum two-impulse transfer between two positions in two different heliocentric orbits is described. The formulas are based on earlier work by McCue and Bender (1965) for optimum two-impulse transfers between two orbits about the earth. The contours of minimum total Delta-V(Delta-V to launch plus Delta-V to achieve a given final orbit at the target body) are plotted on axes of true anomaly of the launch body at launch and true anomaly of the target body at arrival. The optimum transfers obtained are 'time-open' and the Delta-V from the initial orbit to the final orbit is found using patched conics. These 'prime rib' plots are useful for selecting initial conditions in the early phases of mission design.
    Keywords: ASTRODYNAMICS
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 7; 458-461
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    A Monte Carlo simulation of the Infrared Astronomical Satellite (IRAS) mission (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The development of a Monte Carlo simulation of numerous aspects of the IRAS mission is described. The formulations used in modelling the infrared sky, the radiation environment, and the telescope are discussed. The results of running the simulation with varying mission parameters are presented.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AAS PAPER 83-383
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Long-term individual recovery for the IRAS mission (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: IRAS (Infrared Astronomical Satellite) was launched on January 25, 1983 with the primary purpose of performing an infrared survey of the entire celestial sphere. Holes were left in the main survey when some areas received less than the minimum 2-layer coverage. A second survey filled in many of these holes; however, many still required long-term individual recovery. The result was a smooth survey with 96 percent of the sky covered to the desired depth of 2 or more layers.
    Keywords: ASTRODYNAMICS
    Type: AIAA PAPER 84-2012
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Accessibility of near-earth asteroids (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Missions to near-earth asteroids are of interest to both scientists and prospectors in search of extraterrestrial materials. The primary consideration in selecting the object to explore is accessibility, or the global minimum total Delta-V for a two-impulse transfer or less than 360 deg from standard Shuttle orbit to rendezvous with the asteroid. A ranking by accessibility of all known near-earth asteroids is presented. In addition, actual mission opportunities with launch dates between 1990 and 2010 for the most accessible are listed and compared with the optimal rendezvous. Actual sample return opportunities are investigated for the best candidates.
    Keywords: ASTRODYNAMICS
    Type: Journal of Guidance, Control, and Dynamics (ISSN 0731-5090); 10; 225-232
    Format: text
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    NASA TECHNICAL REPORTS
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