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  • 1
    Electronic Resource
    Electronic Resource
    Infrared Spectroscopy of Comet Hale-Bopp (1997)
    Springer
    Earth, moon and planets 78 (1997), S. 71-80 
    Details
    ISSN: 1573-0794
    Keywords: Infrared ; spectroscopy ; composition ; comets
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract High resolution (λ/δλ ∼ 20,000) spectra of comet C/1995 O1 (Hale-Bopp) in the 2–5 μm region were obtained during UT 2–5 March 1997 using CSHELL at the NASA Infrared Telescope Facility (IRTF) on Mauna Kea. The heliocentric and geocentric distances of the comet were ∼1.1 AU and ∼1.5 AU,respectively. We detected emission lines of the gas-phase molecules H2O, 4, C2H6, C2H2, HCN, and CO and derived absolute production rates and relative abundances for all species. We also used the 2-dimensional nature of the CSHELL data to investigate the spatial distribution of the molecules and find evidence that CO was derived at least partly from an extended source in the coma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1006227530238
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    Paper (German National Licenses)
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  • 2
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    Wide field and diffraction limited array camera for SIRTF (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Infrared Array Camera for the Space Infrared Telescope Facility (SIRTF/IRAC) is capable of two-dimensional photometry in either a wide field or diffraction-limited mode over the wavelength interval from 2 to 30 microns. Three different two-dimensional direct readout (DRO) array detectors are being considered: Band 1-InSb or Si:In (2-5 microns) 128 x 128 pixels, Band 2-Si:Ga (5-18 microns) 64 x 64 pixels, and Band 3-Si:Sb (18-30 microns) 64 x 64 pixels. The hybrid DRO readout architecture has the advantages of low read noise, random pixel access with individual readout rates, and nondestructive readout. The scientific goals of IRAC are discussed, which are the basis for several important requirements and capabilities of the array camera: (1) diffraction-limited resolution from 2-30 microns, (2) use of the maximum unvignetted field of view of SIRTF, (3) simultaneous observations within the three infrared spectral bands, and (4) the capability for broad and narrow bandwidth spectral resolution. A strategy has been developed to minimize the total electronic and environmental noise sources to satisfy the scientific requirements.
    Keywords: SPACECRAFT INSTRUMENTATION
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Wide field and diffraction limited array camera for SIRTF (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The Infrared Array Camera for the space Infrared Telescope Facility (SIRTF/IRAC) is capable of two-dimensional photometry in either a wide field or diffraction-limited mode over the wavelength interval from 2 to 30 microns. Three different two-dimensional direct readout (DRO) array detectors will be used: Band 1-InSb or Si:In (2-5 microns) 128 x 128 pixels, Band 2-Si:Ga (5-18 microns) 64 x 64 pixels, and Band 3-Si:Sb (18-30 microns) 64 x 64 pixels. The hybrid DRO readout architecture has the advantages of low read noise, random pixel access with individual readout rates, and nondestructive readout. The scientific goals of IRAC are discussed, which are the basis for several important requirements and capabilities of the array camera: (1) diffraction-limited resolution from 2-30 microns, (2) use of the maximum unvignetted field of view of SIRTF, (3) simultaneous observations within the three infrared spectral bands, and (4) the capability for broad and narrow bandwidth spectral resolution. A strategy has been developed to minimize the total electronic and environmental noise sources to satisfy the scientific requirements.
    Keywords: SPACECRAFT INSTRUMENTATION
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Report of the heterodyne submillimeter-wave sensors panel (1991)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: After reviewing the science goals of the Astrotech 21 mission set, and comparing the resulting receiver performance requirements with existing technology, the panel determined that there were significant unmet requirements in four areas: local oscillator power and mixer sensitivity in the Tera-Hz regime, infrared spectrometer channel count, and array technology in any form. A comprehensive development plan has been prepared to provide these capabilities in the time frame needed before technology freeze dates of the respective missions. It was also noted that development of these capabilities has immense payoff for future astrophysics missions, as it opens entire new areas of spectroscopy and imaging in the critical submillimeter wave regime rich in molecular transitions.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: JPL, California Inst. of Tech., Workshop Proceedings: Sensor Systems for Space Astrophysics in the 21st Century, Volume 2; p 50-57
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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