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  • 11
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    Infrared observations of the dark side of Iapetus (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: J, H, K, L and L-prime broadband and 2.8-3.8 micron narrowband photometric observations have been made of the dark side of Iapetus with circularly variable filter techniques. A 3-micron absorption feature is found which is too deep to be a residual water frost feature from the bright material around the poles. In light of laboratory simulations showing that the dark material must have a strong 3-cm absorption, it is suggested that the material may be a hydrated silicate mixed with a small amount of water frost.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 49; Mar. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    The composition of asteroid 2 Pallas and its relation to primitive meteorites (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: High resolution spectroscopic observations of asteroid 2 Pallas from 1.7-3.5 microns are reported. These data are combined with previous measurements from 0.4-1.7 microns to interpret Pallas' surface mineralogy. Evidence is found for low-Fe(2+) hydrated silicates, opaque components, and low Fe(2+) anhydrous silicates. This assemblage is very similar to carbonaceous chondrite matrix material such as is found in type CI and CM meteorites, but it has been subjected to substantial aqueous alteration and there is a major extraneous anhydrous silicate component. This composition is compared to that of asteroid 1 Ceres. Although there are substantial differences in their broad band spectral reflectances it appears that both asteroids are genetically related to know carbonaceous chondrites.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 56; 398-408
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  • 13
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    Multispectral mapping of the lunar surface using ground-based telescopes (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Images of the lunar surface were obtained at several wavelengths using a silicon vidicon imaging system and ground-based telescopes. These images were recorded and processed in digital form so that quantitative information was preserved. The photometric precision of the images is shown to be better than 1%. Ratio images calculated by dividing images obtained at two wavelengths (0.40/0.56 and 0.95/0.56 microns) are presented for about 50% of the lunar frontside. Spatial resolution is about 2 km at the subearth point. A complex of distinct units is evident in the images. Earlier work with the reflectance spectrum of lunar materials indicates that, for the most part, these units are compositionally distinct.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 29; Sept
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    NASA TECHNICAL REPORTS
  • 14
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    Remote spectroscopic identification of carbonaceous chondrite mineralogies Applications to Ceres and Pallas (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: High-resolution spectroscopic observations of asteroids Ceres and Pallas have been obtained in the 1.0- to 2.6-micron region. Combined with previous spectral measurements at other wavelengths, this work presents the broadband spectral reflectances of these asteroids over the 0.4- to 3.6-micron region. This extended coverage permits new analyses of the surface mineralogies of these objects. Using laboratory comparison spectra of meteorites and mixtures of terrestrial minerals, the surfaces of Ceres and Pallas are consistent with mixtures of opaques and hydrated silicates, such as are found in types C1 and C2 meteorites. This research emphasizes the importance of the 3-micron spectral region for studying by remote methods the relationship of carbonaceous chondrite mineralogies to asteroid surfaces.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 39; Aug. 197
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  • 15
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    The nature of C-class asteroids from 3-micron spectrophotometry (1985)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: Narrowband spectrophotometry between 2.3 and 3.5 micrometers is presented for 14 main-belt C asteroids greater than 100 km in diameter. Absorption features at 3 micrometers due to water of hydration are present in the spectra of nine of the asteroids, with intensities ranging from 6 to 23 percent. The other five asteroids have no such absorption greater than 2 percent in intensity. The present C-asteroid population may be fragments of larger parent bodies with anhydrous C3-like cores and hydrated C1I- or C2M-like mantles.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 63; 183-191
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  • 16
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    2.7- to 4.1-micron spectrophotometry of icy satellites of Saturn and Jupiter (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Spectrophotometry is presented in the 2.7-4.1 micrometer spectral region for icy satellites of Saturn (Tethys, Dione, Rhea, Iapetus and Hyperion) and Jupiter (Europa, Ganymede and Callisto). The 3.6-micrometer reflectance peak characteristic of fine-grained water ice is observed prominently on the satellites of Saturn, faintly on the leading side of Europa, and not at all on Ganymede, Callisto or the dark side of Iapetus. The spectral reflectances of these icy satellites may be affected by their equilibrium surface temperatures and magnetospheric effects.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 63; 237-242
    Format: text
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