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  • 1
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    Asteroid mission alternatives (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The options for asteroid missions are evaluated within the constraints of existing or planned launch vehicles and low-thrust propulsion systems. A wide variety of missions is possible, including flyby, rendezvous, and even sample return. The multi-asteroid rendezvous concept requires an ion drive low-thrust propulsion system of the type being developed for a comet rendezvous. It is indicated that there are plentiful opportunities for such missions to visit four asteroids with stay times of 60-90 days each and with transit times between rendezvous of the order of a year.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA, Washington Asteroids; p 225-244
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    An analysis of gravity assisted trajectories to solar system targets. (1966)
    In:  Other Sources
    Details
    Publication Date: 2019-05-30
    Description: Gravity assisted trajectories to solar system targets analyzed by two-dimensional solar system model
    Keywords: SPACE SCIENCES
    Type: AIAA PAPER 66-10
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Circulating transportation orbits between earth and Mars (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper describes the basic characteristics of circulating (cyclical) orbit design as applied to round-trip transportation of crew and materials between earth and Mars in support of a sustained manned Mars Surface Base. The two main types of nonstopover circulating trajectories are the socalled VISIT orbits and the Up/Down Escalator orbits. Access to the large transportation facilities placed in these orbits is by way of taxi vehicles using hyperbolic rendezvous techniques during the successive encounters with earth and Mars. Specific examples of real trajectory data are presented in explanation of flight times, encounter frequency, hyperbolic velocities, closest approach distances, and Delta V maneuver requirements in both interplanetary and planetocentric space.
    Keywords: ASTRODYNAMICS
    Type: AIAA PAPER 86-2009
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Gravity-assisted trajectories to solar-system targets. (1966)
    In:  Other Sources
    Details
    Publication Date: 2019-05-30
    Description: Gravity assisted trajectories to solar system targets analyzed by two-dimensional solar system model
    Keywords: SPACE SCIENCES
    Type: AIAA PAPER 66-10 , /AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS
    Format: text
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  • 5
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    A survey of multiple missions using gravity-assisted trajectories (1966)
    In:  CASI
    Details
    Publication Date: 2019-05-30
    Description: Launch opportunities and advantages of gravity- assisted multiple missions to specific solar system targets
    Keywords: SPACE SCIENCES
    Type: NASA-CR-76767 , M-12
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Comparison of advanced propulsion capabilities for future planetary missions (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: This paper summarizes unmanned planetary performance (payload and trip time) of Shuttle-based advanced propulsion systems for 1980-90 missions analyzed as part of the recent NASA/AEC Advanced Propulsion Comparisons Studies. Propulsion system designs and condensed results from over 300 propulsion/mission combinations are discussed. Chemical rocket (CRP), solar electric (SEP), nuclear rocket (NRP), and nuclear electric (NEP) propulsion systems are all considered. In terms of missions flown, total flight time, and number of Shuttle launches required, NEP provides the best performance. Relative to NEP, it is shown that NRP, SEP, and CRP degrade mission performance by 20%, 40%, and 50%, respectively, at nominal payloads.
    Keywords: SPACE SCIENCES
    Type: AIAA PAPER 73-587
    Format: text
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  • 7
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    Round-trip mission requirements for Asteroids 1976 AA and 1973 EC (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The feasibility of manned or unmanned missions to two recently discovered asteroids is assessed. Characteristics of a likely target for a round-trip exploratory excursion include: a period close to one year; and an orbit that is nearly circular and nearly coplanar with the ecliptic. Mass requirements and optimal times of launch are investigated for unmanned and manned missions to Asteroids 1976 AA and 1973 EC (recently numbered 1943); 365-day round-trip trajectories in the first half of the 1990s are proposed. However, since neither of the two targets considered entirely fulfills all the necessary orbital characteristics, neither can offer the opportunity for a fast low-energy round-trip mission; nevertheless, other minor planets crossing earth's orbit may be found to meet the requirements.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Icarus; 31; Aug. 197
    Format: text
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  • 8
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    Trajectory and propulsion characteristics of comet rendezvous opportunities (1970)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Trajectory and propulsion characteristics of spacecraft rendezvous mission opportunities to comets during 1975 to 1995
    Keywords: SPACE SCIENCES
    Type: NASA-CR-121762 , T-25
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    The accessible regions presentation of gravity-assisted trajectories using Jupiter (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Accessibility of solar system regions to earth launched spacecraft using Jupiter gravity- assisted trajectories
    Keywords: SPACE SCIENCES
    Type: NASA-CR-87495 , T-18
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Touring the Galilean satellites (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Galilean satellites touring by Jupiter spacecraft, discussing orbit calculation and encounter geometry
    Keywords: SPACE SCIENCES
    Type: AIAA PAPER 70-1070 , AMERICAN ASTRONAUTICAL SOCIETY AND AMERICAN INST. OF AERONAUTICS AND ASTRONAUTICS, ASTRODYNAMICS CONFERENCE; Aug 19, 1970 - Aug 21, 1970; SANTA BARBARA, CA
    Format: text
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