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  • LUNAR AND PLANETARY EXPLORATION  (848)
  • EARTH RESOURCES AND REMOTE SENSING  (670)
  • 1995-1999  (31)
  • 1975-1979  (1.487)
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  • 1
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    The diameter of Pallas from its occultation of SAO 85009 (1979)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The May 29, 1978, occultation of SAO 85009 by Pallas was observed photoelectrically at seven widely spaced sites. The observations are well represented by an elliptical apparent limb profile having semimajor and semiminor axes of 279.5 + or - 2.9 and 262.7 + or - 4.5 km, respectively. Combining these results with published information on the light curve and rotational pole position, Pallas's mean diameter is found to be 538 + or - 12 km, which yields a mean density for Pallas of 2.8 + or - 0.5 g/cu cm and a visual geometric albedo of 0.103 + or - 0.005. The diameter of Pallas as determined from this occultation is significantly smaller than the values derived by radiometric, polarimetric, and double-image techniques.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Astronomical Journal; 84; Feb. 197
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 2
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    The imaging photopolarimeter experiment on Pioneer 11 (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: For 2 weeks continuous imaging, photometry, and polarimetry observations were made of Jupiter and the Galilean satellites in red and blue light from Pioneer 11. Measurements of Jupiter's north and south polar regions were possible because the spacecraft trajectory was highly inclined to the planet's equatorial plane. One of the highest resolution images obtained is presented here along with a comparison of a sample of our photometric and polarimetric data with a simple model. The data seem consistent with increased molecular scattering at high latitudes.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Science; 188; May 2
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    A Titan exploration study: Science, technology and mission planning options, volume 1 (1976)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Mission concepts and technology advancements that can be used in the exploration of the outer planet satellites were examined. Titan, the seventh satellite of Saturn was selected as the target of interest. Science objectives for Titan exploration were identified, and recommended science payloads for four basic mission modes were developed (orbiter, atmospheric probe, surface penetrator and lander). Trial spacecraft and mission designs were produced for the various mission modes. Using these trial designs as a base, technology excursions were then made to find solutions to the problems resulting from these conventional approaches and to uncover new science, technology and mission planning options. Several mission modes were developed that take advantage of the unique conditions expected at Titan. They include a combined orbiter, atmosphere probe and lander vehicle, a combined probe and surface penetrator configuration and concepts for advanced remote sensing orbiters.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: NASA-CR-137846 , MCR-76-186-VOL-1
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 4
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    A Titan exploration study: Science, technology, and mission planning options, volume 2 (1976)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: For abstract, see Vol. 1
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: NASA-CR-137847 , MCR-76-186-VOL-2
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 5
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    Mars sample return through parking orbit (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: A Mars surface sample return mission using Mars direct entry and Mars parking orbit return is described. The mission is designed for a minimum energy requirement and is relatively simple in comparison to the alternative Mars orbital rendezvous mode. The design calls for minimal science, and uses a single Titan IIIE/Centaur launch vehicle. The primary science areas included are biology, biochemistry, geochemistry, and petrology, for detecting life, age dating, and determining chemical compositions and rock types. The total minimum sample requirement would be 30 g. Sampling conditions and recommended measurements are discussed. Maximum use of hardware and experience from the Mariner, Pioneer, and Viking missions is contemplated. The profile for a 1979 conjunction-class mission would include a total time of 1025 days, including one year in Mars parking orbit after sampling. The lander structure, components, and recovery alternatives are explained.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Astronautics and Aeronautics; 13; Jan. 197
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 6
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    Evidence for lightning on Venus (1979)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: Evidence for lightning on Venus obtained by the Pioneer Venus 1 Orbiter is presented. The first indications of lightning were detected by the electric field detector on board the Orbiter when the spacecraft periapsis, which is well within the ionosphere, moved into the night side of the planet. Impulsive wave signals were primarily detected at altitudes less than 25 km, and were found to be strongest at frequencies corresponding to propagation in the whistler mode, occurring at an average rate of about 0.5/sec. The signals were often observed during intervals of low and variable electron densities. It is tentatively concluded on the basis of the above observations that the impulsive events were caused by Venusian lightning.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Nature; 279; June 14
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 7
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    Synthetic Aperture Radar (SAR) data processing (1978)
    In:  CASI
    Details
    Publikationsdatum: 2016-06-07
    Beschreibung: The available and optimal methods for generating SAR imagery for NASA applications were identified. The SAR image quality and data processing requirements associated with these applications were studied. Mathematical operations and algorithms required to process sensor data into SAR imagery were defined. The architecture of SAR image formation processors was discussed, and technology necessary to implement the SAR data processors used in both general purpose and dedicated imaging systems was addressed.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Active Microwave Users Workshop Rept.; p 197-277
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 8
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    Thermal mapping, geothermal source location, natural effluents and plant stress in the Mediterranean coast of Spain (1979)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: There are no author-identified significant results in this report.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E80-10156 , NASA-CR-163173 , PR-2
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 9
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    Absorption of whistler mode waves in the ionosphere of Venus (1979)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: It is shown that whistler mode waves from the ionosheath of Venus are absorbed by Landau damping at the dayside ionosphere boundary. This process heats the ionospheric electrons and it may provide an important energy input into the dayside ionosphere. Cyclotron damping of the waves does not occur in the same region. However, Landau damping of ionosheath waves is apparently not an important energy source in the nightside ionosphere. Impulsive events in the nightside ionosphere seem to fall into two classes: (1) lightning signals (near periapsis) and (2) noise, which may be caused by gradient or current instabilities.
    Schlagwort(e): LUNAR AND PLANETARY EXPLORATION
    Materialart: Science; 205; July 6
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    NASA TECHNICAL REPORTS
  • 10
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    Evaluation of Skylab data for land use mapping (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Skylab multispectral scanner data, digitized Skylab color IR photography, digitized Skylab black and white multiband photography, and Earth Resources Technology Satellite (ERTS) multispectral scanner data collected within a twenty-four hour time period over an area in south-central Indiana near Bloomington on June 9 and 10, 1973, were compared in a machine-aided land use analysis of the area. The overall classification performance results, obtained with nine land use classes were 87% correct classification using the 'best' 4 channels of the Skylab multispectral scanner, 80% for the channels on the Skylab multispectra scanner, which are spectrally comparable to the ERTS multispectral scanner, 88% for the ERTS multispectral scanner, 83% for the digitized color IR photography, and 76% for the digitized black and white multiband photography. The results indicate that the Skylab multispectral scanner may yield even higher classification accuracies when a noise filtered multispectral scanner data set becomes available in the near future.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Journal of the Astronautical Sciences; 23; Apr
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
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