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  • 1
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    The 16- to 38-micron spectrum of Callisto (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The emission spectrum of Callisto was measured between 16 and 38 microns with a spectral resolution of 1/30 of a wavelength, using the NASA Kuiper Airborne Observatory on the night of October 30-31, 1975. Within the errors, the observed spectrum is like that of a 155 K blackbody, in both shape and absolute intensity. The infrared emission and diameter of Callisto indicate a bolometric Bond albedo of 0.05 + or - 0.14, which is consistent with heating of the surface by absorbed sunlight.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 41; Mar. 198
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    16-30 micron spectroscopy of Titan (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Titan has been observed from 16 to 30 micron with a resolution of 1 micron. Earlier broad-band data are consistent with the new measurements, which show that the disk integrated flux is nearly constant over the observed range of wavelengths. Limits on the CH4, H2, and N2 column densities and pressures at the bottom of the upper layer are derived. These indicate that if the atmosphere gas is CH4, an H2-CH4 mix, or N2, the inversion layer must be at pressures less than 30 millibars.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Astrophysical Journal; vol. 236
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Venus - The 17- to 38-micron spectrum (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A far-IR emission spectrum of Venus covering the wavelength range from 17 to 38 microns is examined which was obtained on five nights at an altitude of 14 km with the 30-cm telescope of the NASA Lear Jet. The spectrum is found to be characterized by an overall continuum level with noticeable absorption shortward of 20 microns and longward of 30 microns as compared with a 245-K blackbody. The continuum level is taken as implying a continuous source of opacity in the Venusian atmosphere over the entire range from 17 to 38 microns with increased opacity shortward of 20 microns and longward of 30 microns. It is shown that a haze of sulfuric acid droplets can provide the necessary opacity and explain the observed depressions. A pressure level of roughly 200 mb is deduced for this spectrum.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 33; Mar. 197
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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