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  • ASTROPHYSICS  (1)
  • SPACECRAFT INSTRUMENTATION  (1)
  • 1995-1999
  • 1990-1994  (2)
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  • 1
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    Galileo Probe Mass Spectrometer experiment (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The chemical and isotopic composition of the Jupiter atmosphere's constituents, including their vertical variations, will be measured by the Galileo Probe Mass Spectrometer instrument through in situ sampling; batch sampling will also be undertaken for noble gas composition and isotopic ratio determinations. The instrument's gas-sampling system is connected to a quadrupole mass analyzer for molecular weight analysis. Threshold values are lowered through sample enrichment by a factor of 100-500 for stable hydrocarbons and by a factor of 10 for noble gases. The instrument follows a sampling sequence of 8192 steps, at a rate of 2 steps/sec.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Space Science Reviews (ISSN 0038-6308); 60; 1-4,
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Detection of the 3.4- and 2.8-micron emission features in Comet Bradfield (1987s) (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Comet Bradfield's 3.4-micron C-H emission feature at 3.4 microns, as well as the emission feature near 2.8 microns, exhibit spectral shapes similar to those noted in Comets Halley and Wilson; the derived abundances of the C-H bonds in all three comets are also comparable (within water production rate uncertainties). These data support the hypothesis that the species responsible for the 3.4- and 2.8-micron features may be common to all comets. Beyond this, the widely differing ages of the three comets suggest that the 3.4-micron feature-emitting organics are not the product of surface irradiation processes after the comets' formation.
    Keywords: ASTROPHYSICS
    Type: Icarus (ISSN 0019-1035); 83; 434-440
    Format: text
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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