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  • 1
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    Variable features on Mars 2: Mariner 9 global results (1973)
    In:  CASI
    Details
    Publication Date: 2006-03-27
    Description: Mariner 9 observations of time variable Martian dark areas and semi-tone areas are commonly resolved into streaks and splotches caused by sand storm particles. Bright streaks are formed by the smaller particles and require exceptionally high velocities for their formation as compared with the more easily saltated larger particles in dark streak areas.
    Keywords: SPACE SCIENCES
    Type: JPL Mariner Mars 1971 Proj., Vol. 4; p 179-217
    Format: text
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  • 2
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    Variable features on Mars. II - Mariner 9 global results. (1973)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Systematic Mariner 9 monitoring of the space and time distribution of Martian bright and dark markings, the streaks and splotches, indicates a range of global correlations. The time-variable classical dark markings owe their configurations and variability to their constituent streaks and splotches, produced by windblown dust. Streaks and splotches are consistent wind direction indicators. Correlation of global streak patterns with general circulation models shows that velocities of about 50 to 90 m/sec above the boundary layer are necessary to initiate grain motion on the surface and to produce streaks and splotches. Detailed examples of changes in Syrtis Major, Lunae Palus, and Promethei Sinus are generally consistent with removal of bright sand and dust and uncovering of darker underlying material as the active agent in such changes, although dark mobile material probably also exists on Mars. The generation of streaks and the progressive albedo changes observed require only threshold velocities of about 2 m/sec for about 1 day at the grain surface.
    Keywords: SPACE SCIENCES
    Type: Journal of Geophysical Research; 78; July 10
    Format: text
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  • 3
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    Mariner 9 television observations of Phobos and Deimos. (1972)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Mariner 9 photographs of Phobos and Deimos have yielded new information about the orbits, rotation periods, sizes, shapes, and surface characteristics of the satellites. Both satellites appear to be in synchronous rotation. They are irregular, heavily cratered bodies whose shapes appear to have been determined largely by impact fragmentation and spalling. The surfaces of both satellites have crater densities close to saturation and nearly identical, very low albedos. Lower limits on the tensile and yield strengths are estimated, and it is concluded that both satellites may consist of well-consolidated, though possibly highly fractured material.
    Keywords: SPACE SCIENCES
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  • 4
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    Photometry and polarimetry (1974)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: A review of available information on the photometry, polarimetry, and narrow band spectrophotometry of Titan discusses five major categories: (1) brightness and color as a function of orbital position; (2) brightness and color as a function of solar phase angle; (3) geometric and bond albedo; (4) reflectance as a function of wavelength; and (5) polarization as a function of solar phase angle. It is concluded that a Saturn-like cloud model may be required to explain the sum of polarimetric and photometric observations.
    Keywords: SPACE SCIENCES
    Type: NASA. Ames Res. Center The Atmos. of Titan; p 43-57
    Format: application/pdf
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  • 5
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    Photometric and polarimetric properties of the Bruderheim chondritic meteorite. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Study of the spectral, photometric, and polarimetric properties of the Bruderheim olivine-hypersthene chondritic meteorite. This meteorite is representative of the most common meteoritic material recovered on earth, and, hence, could also be the most common in interplanetary space. Yet, comparison with astronomical data indicates that none of the asteroids in the main belt for which adequate observations exist can be matched with Bruderheim properties. Only the surface of the Apollo asteroid Icarus does, in light of polarization and photometry data, appear to be consistent with an ordinary chondrite composition. This suggests the possibility that this material, although common in earth-crossing orbits, is rare as a surface constituent in the main asteroid belt.
    Keywords: SPACE SCIENCES
    Type: Icarus; 19; July 197
    Format: text
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  • 6
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    Asteroid reflectivities from polarization curves - Calibration of the 'slope-albedo' relationship. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The relationship between h, the slope of the positive branch of a polarization curve, and A, the normal reflectance of the surface, has been calibrated using a wide range of published data. It is determined that asteroid albedos can be inferred meaningfully by this method without prior knowledge of the detailed mineralogical composition of asteroid surfaces.
    Keywords: SPACE SCIENCES
    Type: Icarus; 19; June 197
    Format: text
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  • 7
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    Mariner 9 television observations of Phobos and Deimos. II. (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Analyses of the Mariner 9 pictures of the Martian satellites have yielded much new information: improved ephemerides, estimates of their principal axes, information about the texture of their surfaces, and estimates of the structural strength of their interiors. Both satellites are found to be in synchronous rotation, as was expected from tidal theory. A close examination of the preorbital satellite pictures has failed to show any unknown satellite. The photometric behavior of Phobos and Deimos indicates that they have intricate surface layers consistent with the presence of a regolith. Morphological features on Phobos and the expected collisional history of both satellites imply that both are made of well-consolidated material.
    Keywords: SPACE SCIENCES
    Type: Journal of Geophysical Research; 78; July 10
    Format: text
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  • 8
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    Photopolarimetric observations of the minor planet Flora. (1971)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Review of the rotation period, phase coefficients, and polarization curve of the unusual asteroid Flora. It is an almost spherical asteroid whose period of rotation is probably 13.6 h, but may be only one half of this. Its surface layer consists of a dark material resembling lunar surface soil, but since the polarization curves of Flora and the moon, though generally similar, are not identical the surface of Flora must differ somewhat either in composition or in texture from that of the moon.
    Keywords: SPACE SCIENCES
    Type: Icarus; 15; Dec. 197
    Format: text
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  • 9
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    Effects of surface roughness on the photometric properties of Mars. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Starting with a macroscopically flat surface which at each point scatters according to the Minnaert law with exponent k, we investigate the photometric effects of increasing the large scale roughness of the surface. It is found that the photometric properties of macroscopically rough surfaces can still be described by the Minnaert law, but with an exponent k1, in general not equal to k. In fact, examples are given where k1 differs considerably from k. Therefore observed values of the Minnaert exponent cannot be used to infer the small scale surface properties of Mars (or of any planet) unless proper allowance is made for the photometric effects of large scale roughness. The azimuthal dependence of k1 provides a sensitive test for the importance of these effects.
    Keywords: SPACE SCIENCES
    Type: Icarus; 16; Apr. 197
    Format: text
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  • 10
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    The location of the Mountains of Mitchel and evidence for their nature in Mariner 7 pictures. (1972)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: SPACE SCIENCES
    Type: Icarus; 16; June 197
    Format: text
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