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  • Other Sources  (372)
  • NASA Technical Reports  (372)
  • ASTRONOMY  (372)
  • 1980-1984  (372)
  • 1984  (372)
  • 11
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    A generalized sine condition and performance comparison of Wolter type II and Wolter-Schwarzschild extreme ultraviolet telescopes (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: An equation similar to the Abbe sine condition is derived for a Wolter type II telescope. This equation and the sine condition are then combined to produce a so called generalized sine condition. Using the law of reflection, Fermat's principle, the generalized sine condition, and simple geometry the surface equations for a Wolter type II telescope and an equivalent Wolter-Schwarzschild telescope are calculated. The performances of the telescopes are compared in terms of rms blur circle radius at the Gaussian focal plane and at best focus.
    Keywords: ASTRONOMY
    Type: Advanced technology optical telescopes II; September 5, 6, 1983; London
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  • 12
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    Perception for a large deployable reflector telescope (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Optical science and technology concepts for a large deployable reflector for far-infrared and submillimeter astronomy from above the earth's atmosphere are discussed. Requirements given at the Asilomar Conference are reviewed. The technical challenges of this large-aperture (about 20-meter) telescope, which will be diffraction limited in the infrared, are highlighted in a brief discussion of one particular configuration.
    Keywords: ASTRONOMY
    Type: Advanced technology optical telescopes II; September 5, 6, 1983; London
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  • 13
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    Coherent optical system of modular imaging collectors (COSMIC) - An approach for a large aperture high angular resolution telescope in space (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Very high angular resolution can be achieved in UV/optical astronomy through interferometers in space. A concept analysis of COSMIC, which may be placed into orbit by the Space Shuttle in the late 1990's, is discussed. The photon-collecting area is three times larger than that of Space Telescope (ST), and exceeds its resolution by approximately an order of magnitude. Several alternative configurations are presented to scope the extent of design approaches which may be achievable within the transportation capability of the Space Shuttle.
    Keywords: ASTRONOMY
    Type: Synthetic aperture systems; August 25, 26, 1983; San Diego, CA
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  • 14
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    Search for white dwarf companions of cool stars with peculiar element abundances (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: A search for a white dwarf companions of cool stars with peculiar element abundances was undertaken. One additional star the xi Cet, was found with a white dwarf companion. It was found that HR 1016, 56Uma, 16 Ser, have high excitation emission lines which indicate a high temperature object in the system. It is suggested that since these indications for high temperature companions were seen for all nearby Ba stars, it is highly probable that all Ba stars have white dwarf companions, and that the peculiar element abundances seen in the Ba stars are due to mass transfer. Observations, arguments and conclusions are presented. White dwarf companions were not found. Together with the Li and Be abundances and the chromospheric emission line spectra in these stars were studied. No white dwarf companions were seen for subgiant CH stars.
    Keywords: ASTRONOMY
    Type: NASA-CR-174030 , NAS 1.26:174030
    Format: application/pdf
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  • 15
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    About the phase functions of atmosphereless bodies in the solar system (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The exhibition of an opposition effect is a phenomenon common to all atmosphereless bodies in the solar system. This effect involves a nonlinear surge in brightness for solar phase angles, alpha, less than about 7 deg, and a nonlinear drop-off in brightness at large phase angles. Except for the moon, Mercury, and close-earth-approaching asteroids, atmosphereless bodies can be observed from earth only in a limited phase angle range. Lumme and Bowell (1981) developed a radiative transfer formalism and showed that multiple scattering between the regolith particles represents an essential factor. It was found that all the phase curves can be generated by only two standard functions with two unknown parameters. The first function is due to single scattering processes in the regolith and the second function is due to multiply scattered light. Another purely empirical approach was also investigated by Lumme et al. (1984). A summary of the fit of an empirical model to 13 objects is provided in the paper.
    Keywords: ASTRONOMY
    Type: Nordic Astronomy Meeting; Sep 03, 1984 - Sep 05, 1984; Helsinki; Finland
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  • 16
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    The international Halley Watch (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The schedule of ground-based and extraterrestrial observations planned for comet Halley during the International Halley Watch (IHW) program is briefly described. A schematic diagram is presented in order to illustrate the lines of communication between the administrators, discipline specialists, and amateur observers participating in IHW. The specific observational activities schedule for the IHW in early late 1985 and early 1986 include: infrared spectroscopic and radiometric observations; photometry and polarimetry, and near nucleus studies. The satellite observation platforms of the IHW will include, the Giotto, VEGA, ISEE-3, and Plant A satellites.
    Keywords: ASTRONOMY
    Type: Asteroids, comets, meteors; Jun 20, 1983 - Jun 22, 1983; Uppsala; Sweden
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  • 17
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    An all-reflective wide-angle flat-field telescope for space (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An all-reflective wide-angle flat-field telescope (WAFFT) designed and built at Goddard Space Flight Center demonstrates the markedly improved wide-angle imaging capability which can be achieved with a design based on a recently announced class of unobscured 3-mirror optical systems. Astronomy and earth observation missions in space dictate the necessity or preference for wide-angle all-reflective systems which can provide UV through IR wavelength coverage and tolerate the space environment. An initial prototype unit has been designed to meet imaging requirements suitable for monitoring the ultraviolet sky from space. The unobscured f/4, 36 mm efl system achieves a full 20 x 30 deg field of view with resolution over a flat focal surface that is well matched for use with advanced ultraviolet image array detectors. Aspects of the design and fabrication approach, which have especially important bearing on the system solution, are reviewed; and test results are compared with the analytic performance predictions. Other possible applications of the WAFFT class of imaging system are briefly discussed. The exceptional wide-angle, high quality resolution, and very wide spectral coverage of the WAFFT-type optical system could make it a very important tool for future space research.
    Keywords: ASTRONOMY
    Type: Instrumentation in astronomy V; Sep 07, 1983 - Sep 09, 1983; London
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  • 18
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    A normal incidence, high resolution X-ray telescope for solar coronal observations (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Efforts directed toward the completion of an X-ray telescope assembly design, the procurement of major components, and the coordination of optical fabrication and X-ray multilayer testing are reported.
    Keywords: ASTRONOMY
    Type: NASA-CR-174145 , NAS 1.26:174145 , SAPR-4
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  • 19
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    Options for a new Arizona observatory - Configurations, costs and site (1984)
    In:  Other Sources
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    Publication Date: 2019-07-13
    Description: The process of creating a major observatory, with emphasis on the configurations, costs, and site involved, is examined. The premise that cost optimization starts with a modestly priced building block, such as a 7.5-m telescope, is considered. The telescope unit and the configurations in which it is used, ranging from a single telescope or a set of separate telescopes, to an MMT in which the light of all of the telescopes can be phased when desired, are described. It is shown that options exist for using elements in a nonredundant linear array or Michelson interferometer. A means of estimating costs of different facilities, all on the same basis, is provided. The importance of placing the observatory on a site, such as Mt. Graham in Arizona, which maximizes the output per unit cost of the facility is discussed.
    Keywords: ASTRONOMY
    Type: Very large telescopes, their instrumentation and programs; Apr 09, 1984 - Apr 12, 1984; Garching
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  • 20
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    Design and technology considerations for the far ultraviolet spectroscopic explorer (FUSE) telescope (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An initial assessment of telescope designs satisfying the basic requirements derived for the FUSE mission is presented. A review of recent optical coating technology indicates that normal incidence telescope designs are viable only for wavelengths greater than about 600 A. It is noted that glancing incidence telescope designs, such as the Wolter Type II or thg Wolter-Schwarzschild, are the only designs with acceptable throughputs for the entire FUSE spectral range. Initial design trade studies have established the fundamental framework for the selection of an optimum Type II design satisfying the FUSE science and engineering requirements. It is also found that current optical fabrication technology, e.g., computer controlled polishing, can accommodate meter class glancing incidence components with figure errors commensurate with 1-2 arcsec imaging.
    Keywords: ASTRONOMY
    Type: Instrumentation in astronomy V; Sep 07, 1983 - Sep 09, 1983; London
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