Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979aj.....84.1459s&link_type=abstract
Astronomical Journal, vol. 84, Oct. 1979, p. 1459-1469.
Astronomy and Astrophysics
Astronomy
49
Astrometry, Radio Sources (Astronomy), Very Long Base Interferometry, Angular Resolution, Brightness, Cross Correlation, Least Squares Method, Radio Astronomy, Sensitivity
Scientific paper
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.
Clark Thomas A.
Counselman Charles C. III
Hinteregger Hans F.
Hutton L. K.
Knight Charles A.
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