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  • 1
    Publication Date: 2019-06-27
    Description: Information is presented on current and planned spacecraft activity for various disciplines: astronomy, earth sciences, meteorology, planetary sciences, aeronomy, solar physics, and life sciences. For active orbiting spacecraft, the epoch date, orbit type, orbit period, apoasis, periapsis, and inclination are given along with the spacecraft weight, launch date, launch site, launch vehicle, and sponsoring agency. For each planned orbiting spacecraft, the orbit parameters, planned launch date, launch site, launch vehicle, spacecraft weight, and sponsoring agency are given.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-TM-X-72539 , NSSDC/WDC-A-R/S-75-01
    Format: application/pdf
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  • 2
    Publication Date: 2019-07-13
    Description: Penetrators are elongated missile-shaped objects designed to implant scientific instrumentation to depths of 1 to 15 meters in a wide variety of soil. A typical penetrator weighs 35 kg and impacts the surface at 150 m/sec oriented as close as possible to vertical. A spacecraft bus carries the penetrators to the target body, controls their deployment, and serves as a data communications relay. The analysis addresses the question of basic feasibility and covers such topics as trajectory requirements and delivered mass capability, deployment modes and penetrator retro sizing, impact site accessibility, guidance and control, and penetrator/bus communications. We conclude that such missions, while difficult in many respects, appear to be technically feasible in the context of Jovian system exploration in the post-1985 time period.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AIAA PAPER 76-800 , Astrodynamics Conference; Aug 18, 1976 - Aug 20, 1976; San Diego, CA
    Format: text
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  • 3
    Publication Date: 2019-07-13
    Description: Results of research and engineering analyses to date show that it is feasible to develop and fly on the first Spacelab mission a multipurpose laboratory in which experiments can be performed on the microphysical processes in atmospheric clouds. The paper presents a series of tables on the Atmospheric Cloud Physics Laboratory, with attention given to experiment classes, the preliminary equipment list (particle generators, optical and imaging devices, particle detectors and characterizers, etc.), initial equipment (scientific equipment subsystems and flight support subsystems), and scientific functional requirements (the expansion chamber, the continuous flow diffusion chamber, the static diffusion chamber, the humidifier, and particle generators).
    Keywords: ASTRONAUTICS (GENERAL)
    Type: International Cloud Physics Conference; Jul 26, 1976 - Jul 30, 1976; Boulder, CO
    Format: text
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  • 4
    Publication Date: 2019-07-13
    Description: The design specifications of the research laboratory as a Spacelab facility are discussed along with the types of planned experiments. These include cloud formation, freezing and scavenging, and electrical phenomena. A summary of the program conferences is included.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: NASA-CR-150230
    Format: application/pdf
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  • 5
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    In:  Other Sources
    Publication Date: 2019-07-13
    Description: Orbital transportation beyond the low earth orbit operating regime of the Space Shuttle will be required for the 1980's and beyond. The characteristics and first order requirements of the mission arenas are discussed in context with a broad spectrum of future space transportation systems. Several concepts are highlighted and identify the distinctly different requirements imposed by manned vehicles versus unmanned vehicles. Considerable analytic and design activities are necessary prior to selection of orbital transportation systems to be developed after the Interim Upper Stage (IUS).
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AAS PAPER 75-141 , Meeting on Space Shuttle Missions of the 80''s; Aug 26, 1975 - Aug 28, 1975; Denver, CO
    Format: text
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  • 6
    Publication Date: 2019-07-13
    Description: An assessment and verification of previous analytic results on the long term risk of earth reentry for hazardous payloads is presented. The two areas were studied: (1) stability of nominal, near-circular storage orbits in the regions between Venus and earth and between earth and Mars, and (2) probability of earth reentry for off-nominal planet-crossing orbits resulting from deployment system failures. In the first area, numerical integrations of the equations of motion are compared with stability predications based on secular perturbation theory. The agreement is good in terms of the heliocentric distances covered and the general behavior of the orbital history, although certain near-resonance situations can lead to difficulty. In the second area, a Monte Carlo simulation of orbital evolution is used and the results compared with Opik's analytic theory of planetary encounters and collision statistics, with data verified to within a close order-of-magnitude.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: AAS PAPER 79-175 , American Astronautical Society and American Institute of Aeronautics and Astronautics, Astrodynamics Specialist Conference; Jun 25, 1979 - Jun 27, 1979; Provincetown, MA
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