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  • Weitere Quellen  (12)
  • NASA Technical Reports  (12)
  • ASTRONOMY  (11)
  • Man/System Technology and Life Support
  • Spacecraft Design, Testing and Performance
  • 1990-1994  (12)
  • 1
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    System concepts for a series of lunar optical telescopes (1992)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: The Lunar Telescope Working Group of the Marshall Space Flight Center, NASA, has conducted conceptual studies of an evolutionary family of UV/ optical/IR telescopes to be based on the lunar surface. Included are: (1) the 16-m aperture Large Lunar Telescope; (2) the 4-m aperture precursor Lunar Cluster Telescope Experiment; and (3) the 2-m Lunar Transit Telescope proposed by John McGraw of the Steward Observatory. Development and emplacement of these advanced astronomical facilities would parallel the buildup of an initial lunar exploration site, an early lunar outpost, and a permanent lunar base. The Working Group has examined the feasibility of constructing such telescopes and assessed technology, subsystem, system, transportation, and operations requirements for their development and emplacement. Influences of the lunar environment and site selection on telescope design and operation were also evaluated.
    Schlagwort(e): ASTRONOMY
    Materialart: In: Engineering, construction, and operations in space III: Space '92; Proceedings of the 3rd International Conference, Denver, CO, May 31-June 4, 1992. Vol. 2 (A93-41976 17-12); p. 1809-1831.
    Format: text
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  • 2
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    Imaging the sun in hard X-rays - Spatial and rotating modulation collimators (1991)
    In:  Other Sources
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    Publikationsdatum: 2011-08-24
    Beschreibung: Several approaches to imaging hard X-rays emitted from solar flares have been proposed or are planned for the nineties including the spatial modulation collimator (SMC) and the rotating modulation collimator (RMC). A survey of current solar flare theoretical literature indicates the desirability of spatial resolutions down to 1 arcsecond, field of views greater than the full solar disk (i.e., 32 arcminutes), and temporal resolutions down to 1 second. Although the sun typically provides relatively high flux levels, the requirement for 1 second temporal resolution raises the question as to the viability of Fourier telescopes subject to the aforementioned constraints. A basic photon counting, Monte Carlo 'end-to-end' model telescope was employed using the Astronomical Image Processing System (AIPS) for image reconstruction. The resulting solar flare hard X-ray images compared against typical observations indicated that both telescopes show promise for the future.
    Schlagwort(e): ASTRONOMY
    Materialart: In: EUV, X-ray, and gamma-ray instrumentation for astronomy II; Proceedings of the Meeting, San Diego, CA, July 24-26, 1991 (A93-34376 13-35); p. 155-179.
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  • 3
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    Planetary astronomy (1991)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: The goal is to use a variety of observational techniques and instruments, and to reduce, interpret, and synthesize ground based astronomical data concerning small bodies in the solar system, especially the asteroids, in order to study the compositions, physical characteristics, population properties, and evolution of these bodies. Progress was made in the following areas: faint asteroid taxonomy survey; photometric geodesy of Main Belt asteroids; and Main Belt and Near Earth Asteroids synthesis studies.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA, Washington, Reports of Planetary Astronomy, 1991; p 27-28
    Format: application/pdf
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  • 4
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    Radio astronomy (1991)
    In:  CASI
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    Publikationsdatum: 2013-08-31
    Beschreibung: The following subject areas are covered: (1) scientific opportunities (millimeter and sub-millimeter wavelength astronomy; meter to hectometer astronomy; the Sun, stars, pulsars, interstellar masers, and extrasolar planets; the planets, asteroids, and comets; radio galaxies, quasars, and cosmology; and challenges for radio astronomy in the 1990's); (2) recommendations for new facilities (the millimeter arrays, medium scale instruments, and small-scale projects); (3) continuing activities and maintenance, upgrading of telescopes and instrumentation; (4) long range programs and technology development; and (5) social, political, and organizational considerations.
    Schlagwort(e): ASTRONOMY
    Materialart: National Academy of Sciences(National Research Council, Working Papers: Astronomy and Astrophysics Panel Reports; 23 p
    Format: application/pdf
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  • 5
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    Near-Earth asteroids: Observer alert network and database analysis (1991)
    In:  CASI
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    Publikationsdatum: 2013-08-31
    Beschreibung: The Planetary Science Institute (PSI) was funded by SERCulpr to develop a communication network to alert observers of newly discovered near-earth asteroids (NEA's). This network is intended to encourage observers to obtain physical observations of NEA's, which are needed in order to characterize and assess the resource potential of these bodies. This network was declared operational in October 1990 via an announcement to the asteroid observing community. The PSI is also supported to develop the Near-Earth Asteroid Database (NEAD), a comprehensive database of physical and dynamical data on NEA's. In the past year, the database was updated on newly discovered NEA's during 1990, and new data on radar observations and dynamical classifications were added.
    Schlagwort(e): ASTRONOMY
    Materialart: Arizona Univ., NASA Space Engineering Research Center for Utilization of Local Planetary Resources; 7 p
    Format: application/pdf
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  • 6
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    Attitude Sensor Calibration for the Topography Experiment (TOPEX) Spacecraft (1993)
    In:  Other Sources
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    Publikationsdatum: 2018-06-08
    Beschreibung: A ground-based software system to calibrate the attitude control sensors for the Ocean Topography Experiment (TOPEX) spacecraft is described.
    Schlagwort(e): Spacecraft Design, Testing and Performance
    Format: text
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  • 7
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    Elemental abundances of the B and A stars. 2: Gamma Geminorum, HD 60825, 7 Sextantis, HR 4817, and HR 5780 (1994)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: We extend fine analyses of the B and A stars, gamma Geminorum, 7 Sextantis, HR 4817, and HR 5780 using additional spectroscopic data from the Kitt Peak National Observatory (KPNO) coude feed telescope with a TI CCD, camera 5, and grating A, and ATLAS9 model atmospheres. In addition we study HD 60825, which had colors similar to the FHB A stars, but was found to be a Population I star. HD 60825, as is gamma Gem, is a sharp-lined early-A star with nearly solar derived abundances. HR 5780 and 7 Sex are also examples of stars which for the most part have solar abundances. The newly derived abundances for HR 4817 reveal important differences with respect to 53 Tau, a somewhat similar HgMn star.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 106; 706; p. 1239-1247
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  • 8
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    Mark-III VLBI astrometry of pulsars (1991)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: Differential 18-cm VLBI measurements of the position of PSR 1937 + 214 with respect to the quasar 1923 + 210 are reported. The preliminary results for VLBI minus timing position are +21 +/- 2 milliarcsec in right ascension and +14 +/- 9 milliarcsec in declination. The results show the value of combining the large collecting area of the Arecibo telescope with the Mk-III VLBI recording system.
    Schlagwort(e): ASTRONOMY
    Materialart: IAU Colloquium on Radio Interferometry: Theory, Techniques and Applications; Oct 08, 1990 - Oct 12, 1990; Socorro, NM; United States
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  • 9
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    A lunar based solar observatory - Rationale and concepts (1990)
    In:  Other Sources
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    Publikationsdatum: 2019-07-13
    Beschreibung: The rationale for a lunar solar observatory is described and the requirements for various candidate instruments are developed. The unique characteristics of the lunar surface, its stability, low seismicity, and long unobstructed paths make it an ideal site for a large, high performance optical telescope. The capabilities of such an instrument is used, as an example (1) for the science that might be achieved from the lunar surface, (2) to identify the magnitude of the instrumentation, and (3) to indicate the technologies that must be developed if such an observatory is to become a reality.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysics from the Moon; Feb 05, 1990 - Feb 07, 1990; Annapolis, MD; United States
    Format: text
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  • 10
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    System concepts for a large UV/optical/IR telescope on the moon (1991)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: To assess the systems and technological requirements for constructing lunar telescopes in conjunction with the buildup of a lunar base for scientific exploration and as a waypoint for travel to Mars, the NASA Marshall Space Flight Center conducted concept studies of a 16-m-aperture large lunar telescope (LLT) and a 4-m-aperture precursor telescope, both operating in the UV/visible/IR spectral region. The feasibility of constructing a large telescope on the lunar surface is assessed, and its systems and subsystems are analyzed. Telescope site selection, environmental effects, and launch and assembly scenarios are also evaluated. It is argued that key technical drivers for the LLT must be tested in situ by precursor telescopes to evaluate such areas as the operations and long-term reliability of active optics, radiation protection of instruments, lunar dust mitigation, and thermal shielding of the telescope systems. For a manned lunar outpost or an LLT to become a reality, a low-cost dependable transportation system must be developed.
    Schlagwort(e): ASTRONOMY
    Materialart: Space Astronomical Telescopes and Instruments; Apr 01, 1991 - Apr 04, 1991; Orlando, FL; United States
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