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  • ASTRONOMY  (3)
  • LASERS AND MASERS  (1)
  • 1
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    Submilliarcsecond astrometry via VLBI. I - Relative position of the radio sources 3C 345 and NRAO 512 (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The relative position and relative proper motion of the radio sources 3C 345 and NRAO 512 are estimated from four sets of VLBI observations spread out over the period from October 1971 to May 1974. The use of phase-connection techniques yields the separation, in 1950.0 coordinates, of the centers of brightness of the compact components of the two sources. An upper bound of 0.0005 arcsec/yr is placed on the relative proper motion (70% estimated confidence limits). Bounds that can be placed on the distances to the two sources are considered, prospects for improvement in the determination of relative position and proper motion of these sources are discussed, and other possible applications of the basic technique are described.
    Keywords: ASTRONOMY
    Type: Astronomical Journal; 84; Oct. 197
    Format: text
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  • 2
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    Analysis of lunar laser ranging data for Earth dynamics applications (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The effects of elasticity and of tidal friction within the Moon were incorporated into the numerical model of the Moon's rotation which was used in an effort to determine the axial rotation of the Earth, as measured by Universal Time. Some 2,651 normal points representing ranges measured to Lunokhod 2, and to the Apollo 11, 14, and 15 retroflectors were analyzed. Smoothed estimates derived from the lunar rangefinding were compared with smoothed values published by the International Bureau of Time, in the 1968 and 1969 systems. The derived values at the observation sight were connected to corresponding values at the Conventional International Origin, using the BIH data for polar motion. Differences are discussed.
    Keywords: LASERS AND MASERS
    Type: NASA-CR-163145
    Format: application/pdf
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  • 3
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    Universal time - Results from lunar laser ranging (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A least squares analysis of lunar laser ranging observations from the McDonald Observatory is used to estimate universal time. In addition to the ranging observations, the analysis simultaneously takes into account the parameters representing the locations of McDonald and the lunar retroreflectors, the orbits of the earth and the moon, and the moon's physical libration. The root-mean-square of the postfit range residuals for the 5-year period from October 1970 to November 1975 is 28 cm. The results are compared with those obtained by the Bureau International de l'Heure and by Stolz et al. (1976), and the reasons for discrepancies are discussed. It is suggested that problems in modeling the moon's motion make difficult the determination of UT with the accuracy inherent in the ranging observations.
    Keywords: ASTRONOMY
    Type: AD-A059667 , AFGL-TR-78-0209 , Journal of Geophysical Research; 83; July 10
    Format: text
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  • 4
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    Analysis of the Capability and Limitations of Relativistic Gravity Measurements Using Radio Astronomy Methods (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The uses of radar observations of planets and very-long-baseline radio interferometric observations of extragalactic objects to test theories of gravitation are described in detail with special emphasis on sources of error. The accuracy achievable in these tests with data already obtained, can be summarized in terms of: retardation of signal propagation (radar), deflection of radio waves (interferometry), advance of planetary perihelia (radar), gravitational quadrupole moment of sun (radar), and time variation of gravitational constant (radar). The analyses completed to date have yielded no significant disagreement with the predictions of general relativity.
    Keywords: ASTRONOMY
    Type: NASA-CR-120687
    Format: application/pdf
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