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  • 1
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    Mission opportunity maps for rendezvous with earth-crossing asteroids (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Rendezvous missions to earth-crossing asteroids are of interest to NASA, for scientific purposes as well as for technological applications and ecological implications. To provide a comprehensive data base for planners of such missions, a mission opportunity map (MOM) has been created for eight relatively easy-to-access asteroids. A MOM presents such mission data as launch dates, flight times, and launch and postlaunch delta V requirements for all useful mission opportunities. The merits of a MOM are: (1) searches for all useful mission oportunities are completed in the process of generating a MOM, and (2) a MOM provides a clear view of good and bad opportunities, the extent of performance variations, and the repeatability of the missions.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Journal of the Astronautical Sciences (ISSN 0021-9142); 37; 399-415
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Ballistic comet exploration mission options (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: To attain the fundamental goals of cometary exploration, rendezvous and sample return missions are necessary. This paper investigates various trajectory options and provides a comprehensive set of mission opportunities available for launches in the 1990s. The modes of explorations considered are rendezvous and flybys with atomized-sample-return missions. For each type of exploration, the paper describes various classes and modes of trajectories available, their inherent characteristics, and the techniques of identifying useful trajectories. The energy requirement associated with these missions and the performance possibilities are provided.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Journal of the Astronautical Sciences (ISSN 0021-9142); 37; 363-397
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Main-belt asteroid exploration - Mission options for the 1990s (1989)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: An extensive investigation of the ways to rendezvous with diverse groups of asteroids residing between 2.0 and 5.0 AU is made, and the extent of achievable missions using the STS upper-stage launch vehicles (IUS 2-Stage/Star-48 or NASA Centaur) is examined. With judicious use of earth, Mars, and Jupiter gravity assists, rendezvous with some asteroids in all regions of space is possible. It is also shown that the STS upper stages are capable of carrying out missions beyond a single rendezvous, namely with several flybys and/or multiple rendezvous.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Journal of the Astronautical Sciences (ISSN 0021-9142); 37; 333-361
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Planetary mission opportunities with nuclear electric propulsion (1992)
    In:  Other Sources
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    Publication Date: 2019-08-27
    Description: An assessment is made of the applicability, benefits, and requirements of nuclear-electric propulsion (NEP) for solar system-exploration missions, within the framework of SP-100 reactor-based power technologies and 30-cm ring-cusp thruster technology. An initial launch date of 2005 is projected from a program-inception date of 2000. The missions in question encompass orbitings and flybys of Pluto, accomplishing in 10-13 years which would ballistically require a transfer time of 40 years; a Neptune orbiting; a Jupiter grand tour which will orbit each of the moons in turn; a Uranus orbiting; and a multiple mainbelt asteroid rendezvous orbiting six selected asteroids.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 92-1560
    Format: text
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    NASA TECHNICAL REPORTS
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