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  • 1
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    TV observations of Phobos - First results (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: From February to March, 1989, Phobos-2 acquired 37 TV images of Phobos at distances from 200 to 1100 km. These images will be used to update the figure model and topographic and geological maps of Phobos, its spectral characteristics and scattering law, the surface composition and texture, and the parameters of the orbital motion and forced libration.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108); 16; 378-388
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Television observations of Phobos (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: In February and March 1989 the Phobos 2 spacecraft took 37 television images of Phobos from a distance of 190-1100 km. The data are being used to update the three-dimensional model of Phobos, to provide improved determinations of its density and orbital dynamics, and to study its surface color, composition, and texture. Preliminary findings are presented here which include different integrated photometric behavior in visible and near-infrared bands, observation of a region immediately west of Stickney which is relatively free of large grooves, the prevalence of bright rims on grooves and younger craters, and low bulk density.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature (ISSN 0028-0836); 341; 585-587
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Voyager 2 at Neptune - Imaging science results (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-08-14
    Description: Neptune's atmosphere is revealed by Voyager 2 images to contain clouds of methane ice above a lower deck of hydrogen sulfide or ammonia ices, and to be dominated by an anticyclonic storm system designated the 'Great Dark Spot'; this bears both similarities and differences to the Great Red Spot of Jupiter. Like the rings of Uranus, those of Neptune are composed of very dark, but in addition very dusty, material. Six new regular satellites have been discovered whose radii range from 25 to 200 km. Triton is noted to be a differentiated body showing evidence of early surface-melting episodes. At least two active plumes are found on Triton, which may be driven by solar heating.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science (ISSN 0036-8075); 246; 1422-144
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Distribution of tessera terrain on Venus - Prediction for Magellan (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Tessera terrain is the dominant tectonic unit in the northern hemisphere of Venus and is characterized by complex sets of intersecting structural trends and distinctive radar properties due to a high degree of meter and sub-meter scale (5 cm to 10 m) roughness. Based on these distinctive radar properties, a prediction of the global distribution of tessera can be made using Pioneer Venus (PV) reflectivity and roughness data. Where available, Benera 15/16 and Arecibo images and PV diffuse scattering data were used to evaluate the prediction. From this assessment, it is concluded that most of the regions with prediction values greater than 0.6 (out of 1) are likely to be tessera, and are almost certain to be techonically deformed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters (ISSN 0094-8276); 17; 171-174
    Format: text
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    NASA TECHNICAL REPORTS
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