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  • 1
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    Voyager imaging experiment (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The Voyager imaging experiment, which involves two independently operated television systems (a narrow- and a wide-angle camera), is designed to conduct investigations of the atmospheres and surface properties of Jupiter, Saturn, their satellites and Saturn's rings. Objects of the investigations include the horizontal and vertical structure of visible clouds, the vertical structure of high, optically thin scattering layers on Jupiter and Saturn, the Great Red Spot, the South Equatorial Belt, chromophores on Io and Titan, the geology of several satellites, the masses, spin axes and periods of rotation of several satellites, the radial distribution of material in Saturn's rings, and the optical scattering properties of the primaries, rings, and satellites at a variety of wavelengths and phase angles.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Space Science Reviews; 21; Nov. 197
    Format: text
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  • 2
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    On a suspected ring external to the visible rings of Saturn (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Reexamination of a photograph of Saturn taken on Nov. 15, 1966, when the earth was nearly in the ring plane, indicates that ring material may exist outside the visible rings, extending to more than 6 Saturnian radii. Although the suspected feature on the photograph appears to be real, the possibility of its being a developed pressure mark or a chance alignment of grains cannot be ruled out. The observed brightness in the blue light was estimated to be 19.5 plus or minus 0.5 per linear arcsecond, implying a normal optical thickness, .0000001 for ice-covered particles. For spacecraft passing through this region, the hazards are found to be minimal.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 3
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    IAU nomenclature for albedo features on the planet Mercury (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The International Astronomical Union has endorsed a nomenclature for the albedo features on Mercury. Designations are based upon the mythological names related to the god Hermes; they are expressed in Latin form. The dark-hued albedo features are associated with the generic term Solitudo. The light-hued areas are designated by a single name without generic term. The 32 names adopted are allocated on the Mercury map.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 34; Apr. 197
    Format: text
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  • 4
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    Jovian cloud structure and velocity fields (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: A global view of Jovian small-scale morphologies and zonal velocity profiles has been discussed previously. In the present paper, a regional comparison is made of the structures and velocity fields (meridional and zonal velocities) in the Jovian atmosphere as observed by Voyager I imaging system. The cloud structures discussed are fairly independent of the visual wavelength. The analysis shows that although both Jovian hemispheres exhibit similar patterns of diminishing and alternating eastward and westward jets as one progresses polewards, there is a pronounced asymmetry in the structural appearance of the two hemispheres.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 280; Aug. 30
    Format: text
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  • 5
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    Zonal velocity and texture in the Jovian atmosphere inferred from Voyager images (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Smith et al. (1970) have described Jupiter's changing appearance at resolutions down to 10 km over intervals as small as 1 h. Examples of small-scale convection, rapid variations of features, and complex interactions of closed vortices were given. In the present paper, these results are extended to include measurements of the latitudinal profile of zonal (eastward) velocity, from which the absolute vorticity gradient is estimated. Also, a classification scheme based on texture (i.e., the patterns of small features visible at resolutions of 100 km or better) is proposed.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 280; Aug. 30
    Format: text
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  • 6
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    Voyager imaging science investigations (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The Voyager imaging science experiment objectives at Saturn include exploratory reconnaissance of Saturn, its satellites and its rings. The imaging cameras are described, along with an abbreviated discussion of specific objectives.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: JPL The Saturn System; p 301-308
    Format: application/pdf
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  • 7
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    The D and E rings of Saturn (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: CCD observations of Saturn ring D, discovered by Guerin in 1969, confirm the existence of this inner ring and indicate that its surface brightness ranges from 0.03 (inner edge) to 0.05 (outer edge) relative to the maximum surface brightness of ring B. If ring D is composed of spherical, diffusely reflecting particles with average surface reflectivity equal to that of the particles in ring B, the average normal optical thickness of ring D is 0.02. Reanalysis of a photograph taken by Feibelman during the 1966 ring plane passage suggests a normal optical thickness for ring E between -1 million and 10 to the minus 7 power, depending upon the average reflectivity of the particles. No new observations of this outer ring will be possible until the earth passes through the Saturn ring plane in 1979-80.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: JPL The Saturn System; p 105-111
    Format: application/pdf
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  • 8
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    Near Infrared Imaging of Uranus and Neptune (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-16
    Description: Imaging of Uranus and Neptune in the deep methane absorption band at 890nm is used to detect high altitude atmospheric hazes and to search for possible undiscovered close in satellites. The appearances of Uranus and Neptune are very different from one another and Uranus seems to be changing with time. The Neptune images show rotation in the direct sense.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: JPL Uranus and Neptune; p 213-223
    Format: text
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  • 9
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    Satellites of Saturn - Geological perspective (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The Voyager encounters have added the satellites of Saturn to those planetary bodies for which geological studies are possible. These satellites are surprisingly heterogeneous, in spite of their apparently common composition of more than half water ice. All are more or less heavily cratered, but most also show clear evidence of substantial endogenic modification and resurfacing during the first few hundred million years of their existence. In the case of Enceladus, this internal activity has been most dramatic and may have persisted into the past billion years of solar-system history. Iapetus also remains a major mystery with its still unexplained hemispheric dichotomy, for which both external and internal causes have been suggested. The current knowledge of the satellites is reviewed from a geologic perspective, using primarily Voyager imaging data. Emphasis is placed on the six larger bodies (except Titan): Rhea, Iapetus, Dione, Tethys, Enceladus, and Mimas.
    Keywords: LUNAR AND PLANETARY EXPLORATION
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  • 10
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    Spectrophotometry and upper limit of gaseous CH4 for Triton (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Spectra of Triton with a CCD spectrometer yielded a relative spectral reflectivity curve from 0.56 to 1.05 micron at a resolution of 25 A. Using low-temperature band model parameters from Fink et al. (1980), an upper limit for the one-way path gaseous CH4 abundance of 1 m-am was derived.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 46; May 1981
    Format: text
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