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  • LUNAR AND PLANETARY EXPLORATION  (4)
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  • 1
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    Evidence for surface heterogeneity on Titan (1993)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Observational results are presented for two rotational periods of Titan which exhibit the albedo difference noted by Lemmon et al. (1993) between this moon's positions at eastern and western elongation relative to Saturn. The persistence of this difference indicates that this heterogeneity is unlikely to be associated with transient features, and must be intrinsic to the surface. The results presented also indicate that Titan is locked in a synchronous orbit around Saturn.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature (ISSN 0028-0836); 364; 6437; p. 511-514.
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Observing the surface of Titan through near-infrared windows in its atmosphere (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Possibilities of observing the surface of Titan through near infrared windows in the atmosphere are explored. Studies of Titan's near infrared spectrum are discussed with particular attention being given to the opacity of Titan's atmosphere, infrared spectra of candidate materials of Titan's surface, and ground based studies of Titan's surface. Instruments on board Cassini which will have the capability to observe Titan in the near infrared are presented together with what they may observe. These instruments include the descent imager/spectral radiometer, the Huygens probe and the visible infrared mapping spectrometer, and the imaging science subsystem.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: ESA, Symposium on Titan; p 199-204
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    NASA TECHNICAL REPORTS
  • 3
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    Titan's surface and troposphere, investigated with ground-based, near-infrared observations (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Characterizations are presently made of Titan's haze, cloud, surface albedo, and atmospheric H2 abundance on the bases of 4000-5000/cm near-IR spectrum and points from the Fink and Larson (1979) 4000-12,500/cm spectrum. The strength of solar radiation absorption varies significantly with wavelength, facilitating a probing of the various atmospheric levels down to the surface. The present observations suggest the existence of an optically thin CH4 cloud layer, as well as haze and cloud optical depths sufficiently small for surface sensing at 4900, 6250, and 7700/cm. The albedos at these wavenumbers indicate the dominant surface material to be 'dirty' water ice.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 93; 362-378
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The tropospheric abundances of NH3 and PH3 in Jupiter's Great Red Spot, from Voyager IRIS observations (1992)
    In:  Other Sources
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    Publication Date: 2019-08-28
    Description: The tropospheric abundances of NH3 and PH3 in Jupiter's Great Red Spot (GRS) are presently determined on the basis of a group of Voyager IRIS spectra, and compared with those of the surrounding South Tropical Zone (STZ) obtained from another two groups of IRIS spectra, in order to characterize the GRS's chemistry and dynamics. Although the GRS is believed to be a region of strong vertical transport, NH3 depletion is surprisingly found to occur below the tropopause within the GRS. Since one of the STZ's selections has a temperature-pressure profile similar to that of the GRS below the 300 mbar level, condensation cannot explain the low NH3 abundance in the GRS.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus (ISSN 0019-1035); 98; 1 Ju
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    NASA TECHNICAL REPORTS
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