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  • SPACECRAFT INSTRUMENTATION  (6)
  • Astronomy  (1)
  • 1
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    The Goddard High Resolution Spectrograph: Instrument, goals, and science results (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The Goddard High Resolution Spectrograph (GHRS), currently in Earth orbit on the Hubble Space Telescope (HST), operates in the wavelength range 1150-3200 A with spectral resolutions (lambda/delta lambda) of approximately 2 x 10(exp 3), 2 x 10(exp 4), and 1 x 10(exp 3). The instrument and its development from inception, its current status, the approach to operations, representative results in the major areas of the scientific goals, and prospects for the future are described.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 106; 702; p. 890-908
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Second generation spectrograph for the Hubble Space Telescope (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The preliminary design for the Space Telescope Imaging Spectrograph (STIS), which has been selected by NASA for definition study for future flight as a second-generation instrument on the Hubble Space Telescope (HST), is presented. STIS is a two-dimensional spectrograph that will operate from 1050 A to 11,000 A at the limiting HST resolution of 0.05 arcsec FWHM, with spectral resolutions of 100, 1200, 20,000, and 100,000 and a maximum field-of-view of 50 x 50 arcsec. Its basic operating modes include echelle model, long slit mode, slitless spectrograph mode, coronographic spectroscopy, photon time-tagging, and direct imaging. Research objectives are active galactic nuclei, the intergalactic medium, global properties of galaxies, the origin of stellar systems, stelalr spectral variability, and spectrographic mapping of solar system processes.
    Keywords: SPACECRAFT INSTRUMENTATION
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  • 3
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    In-flight performance of the IUE (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A report on the initial performance of the IUE satellite, launched in January, 1978, is given. Attention is given to optical performance, camera performance, background corrections, photometric performance, and data reduction. Samples of high-dispersion and low-dispersion spectra are shown. A remaining problem of proper separation of high dispersion orders in data reduction is discussed.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Nature; 275; Oct. 5
    Format: text
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  • 4
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    The IUE spacecraft and instrumentation (1978)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The paper describes the general design, instrumentation, and ground control system of the International Ultraviolet Explorer (IUE) satellite, which will serve as an astronomical observatory providing both high and low resolution UV spectra of sources other than the sun. Basic data are given on the telescope, the UV-visible converter, the spectrograph optics, the camera response, and the communications systems.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Nature; 275; Oct. 5
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  • 5
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    The International Ultraviolet Explorer (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The instrumentation and functioning of the IUE are discussed. The design of the telescope, fine error sensors, echelle spectrographs, and television cameras, as well as their integration, is described. The optical characteristics of the IUE are listed and the schematic arrangement of the detector is depicted. Sources of background noise are assessed, including the thermionic effects in the UV converters and television tubes, radiation from the earth's trapped electron belts, wide angle white light scattering from the earth and sun, scattering of dispersed light caused by low dispersion gratings, photometric calibration, and photometric stability. IUE sensitivity changes during the first three years of operation are shown together with sensitivity curves for short and long wavelengths. Modes of wavelength determination are considered.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Ultraviolet and vacuum ultraviolet systems; Apr 21, 1981 - Apr 22, 1981; Washington, DC
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    NASA TECHNICAL REPORTS
  • 6
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    Faint Object Spectrograph Spectra of the UV Emission Lines in NGC 5558: Detection of Strong Narrow Components (1993)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Ultraviolet spectra of the Seyfert 1 galaxy NGC 5548 were obtained with the Faint Object Spectrograph (FOS) on the Hubble Space Telescope on 1992 July 5, when the UV continuum and broad emission lines were at their lowest ever observed level. The high resolution of the spectra, relative to previous UV observations, and the low state of NGC 5548 allow the detection and accurate measurement of strong narrow components of the emission lines of Ly alpha, C IV 1549, and C III 1909. Isolation of the UV narrow components enables a detailed comparison of narrow-line region (NLR) properties in Seyfert 1 and 2 galaxies, and removal of their contribution is important for studies of the broad-line region (BLR). Relative to the other narrow lines, C IV 1549 is much stronger in NGC 5548 than in Seyfert 2 galaxies, and Mg II 2798 is very weak or absent.
    Keywords: Astronomy
    Type: NASA-CR-202592 , NAS 1.26:202592 , The Astrophysical Journal; 416; L67-L70
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  • 7
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    Progress report on the high resolution spectrograph for the Space Telescope (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The instrument design is complete and many components and subsystems have been manufactured and tested. Solar-blind, multichannel, pulse counting detectors for two ultraviolet spectral bands have been developed and satisfactory flight units have been chosen. A large, lightweight graphite-epoxy optical bench, utilizing fingerplate joints with no metallic parts in order to minimize thermal expansion, has been built. Tests of the engineering model torque-motor-driven grating carrousel indicate that this critical system exceeds tight specifications for accurate and repeatable angular positioning. A complement of large, high-frequency gratings and an echelle is being completed in several laboratories. Software resident in a computer on the spacecraft will control the spectrograph with the capability to alter procedures in response to real-time evaluation of the data.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: Ultraviolet and vacuum ultraviolet systems; Apr 21, 1981 - Apr 22, 1981; Washington, DC
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