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  • 1
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    Evidence for weather on Neptune. I (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Between April 1975 and March 1976 the reflectance of Neptune between 1 and 4 microns increased substantially. A spectrum taken at these wavelengths near the period of peak observed brightness showed a low-intensity continuum with weak superposed absorptions caused by CH4 and H2. Photographic spectra of the planet measured during the same period showed no differences from older published data. The gas abundances derived from the infrared spectrum, 5 plus or minus 2 km-amagat of H2 at a base density of 0.26 plus or minus 0.08 am and no more than about 1 m-am of CH4, appear to refer to an effective reflecting level high in the atmosphere of Neptune.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal; vol. 214
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Infrared observations of the surface and atmosphere of Titan (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Infrared photometry of Titan, Saturn, and Saturn's Rings at 3.5, 4.9, 17.8, and 18.4 microns is reported. Comparison of the albedo of Titan in the 4.9 micron 'window' with the albedo of the rings and with laboratory spectra suggests that frost, possibly water ice, could be a major constituent. If thick clouds are present they must be very dark at 4.9 microns. The 17.8 and 18.4 micron data are not consistent with a clear, dense molecular hydrogen atmosphere.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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