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  • 1
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    First Imaging Results from the Iapetus B/C Flyby of the Cassini Spacecraft (2005)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: The first of two relatively close Iapetus flybys in Cassini's primary mission occured on Dec 31, 2004 18:49 UTC near apoapsis from orbit "B" to "C" at an altitude of approximately 123,400 km over the northern leading hemisphere, resulting in a minimum pixel scale of 740 m for the ISS narrow angle camera (NAC). Data revealed details of a greater than 1300-km-long ridge that had been discovered just one week earlier in optical navigation images. Individual mountains within the western part of the ridge reach heights of approximately 20 km over surrounding terrain. The data set provides constraints on the origin of the albedo dichotomy. It appears very likely that the dark material is overlying an ice crust, but no evidence for emplacement of dark material via surface flows is apparent. Instead, signs for dark-material emplacement through processes that included ballistic transportation are visible. No bright-floor ("punch-through") craters have been found on the dark hemisphere. The ridge discovery may revive the idea of an endogenic origin of the dark side.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXVI, Part 4; LPI-Contrib-1234-Pt-4
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  • 2
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    The First Six Months of Iapetus Observations by the Cassini ISS Camera (2005)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: Since Saturn arrival in June 2004, Iapetus has been studied intensively by the Cassini ISS camera [1] at various ranges. The first of two relatively close flybys in the primary mission occurred on Dec 31, 2004 at an altitude of approx.123,400 km over the northern leading hemisphere, resulting in images with a minimum pixel scale of 740 m. Detailed results of this flyby are given in [2], while this abstract covers the observations obtained earlier. Among the most important discoveries are: (a) Four giant impact basins with diameters between 390 and 550 km were detected, three of them are located in the dark terrain [3]. (b) Data revealed a 〉1300 km long ridge that marks exactly Iapetus' equator within the dark terrain. Individual mountains within the western part of the ridge reach heights of approx.20 km over surrounding terrain [3]. (c) Impact craters were confirmed to be the main geological feature within the dark terrain and at high southern latitudes. (d) There are numerous craters with dark walls roughly facing towards the central parts of the dark hemisphere [3]. (e) Almost all parts of Iapetus have been imaged at least at low resolution (〈 60 km/pxl).
    Keywords: Geophysics
    Type: Lunar and Planetary Science XXXVI, Part 4; LPI-Contrib-1234-Pt-4
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  • 3
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    A Cassini ISS Search for Regolith-Texture Variations on Tethys (2005)
    In:  CASI
    Details
    Publication Date: 2017-10-02
    Description: On October 28, 2004 the Cassini spacecraft flew within 255,500km of Saturn's heavily-cratered icy moon, Tethys. The ISS Narrow Angle Camera (NAC) obtained its first closeup multi-color images of Tethys at a Voyager-comparable spatial resolution of 1.5 km/pixel. The imaging sequence provided 23 NAC images covering 10 NAC color-filter bandpasses (ranging from 338nm to 930nm wavelengths), as well as a Wide Angle Camera (WAC), 3-color (BGR) image set. The images show whole-disk views of Tethys' trailing hemisphere viewed at a phase angle of 50 degrees and with a sub-spacecraft point of (22 deg. N, 270 deg. W). At the spatial resolution of our NAC images, Tethys' 1060 km diameter presents a disk-size of about 350 pixels. Among the images returned are nine frames obtained through NAC polarization-filters at three different spectral bandpasses (UV3: 341nm, GRN: 569nm, and MT2: 727 nm, respectively). In the present study, we use these polarization images to search for possible variations in the microscopic texture of regolith on Tethys.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXVI, Part 8; LPI-Contrib-1234-Pt-8
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  • 4
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    Disk-resolved spectral characteristics of Saturn's medium-sized satellites (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: Voyager-1 and -2 images of six Saturnian satellites were investigated in the orange, green and violet spectral range. The objective of this study is to examine and compare spectral differences of surface features in order to obtain information about compositional trends.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Lunar and Planetary Inst., Twenty-fourth Lunar and Planetary Science Conference. Part 1: A-F; p 401-402
    Format: text
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  • 5
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    Cassini Observes the Active South Pole of Enceladus (2007)
    In:  Other Sources
    Details
    Publication Date: 2019-07-19
    Description: Cassini has identified a geologically active province a the south pole of Saturn's moon Enceladus. The shape of Enceladus suggests a possible intense heating epoch in the past by capture into a 1:4 secondary spin/orbit resonance.
    Keywords: Astronomy
    Type: Science; 311; 5766; 1393-1401
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  • 6
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    Hall effect sensors embedded within two-pole toothless stator assembly (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A two-pole toothless PM machine employs Hall effect sensors to indicate the position of the machine's rotor relative to power windings in the machine's stator. The Hall effect sensors are located in the main magnetic air gap underneath the power windings. The main magnetic air gap is defined by an outer magnetic surface of the rotor and an inner surface of the stator's flux collector ring.
    Keywords: Electronics and Electrical Engineering
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