Submilliarcsecond astrometry via VLBI. I. Relative position of the radio sources 3C 345 and NRAO 512.
Abstract
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.
- Publication:
-
The Astronomical Journal
- Pub Date:
- October 1979
- DOI:
- 10.1086/112565
- Bibcode:
- 1979AJ.....84.1459S
- Keywords:
-
- Astrometry;
- Radio Sources (Astronomy);
- Very Long Base Interferometry;
- Angular Resolution;
- Brightness;
- Cross Correlation;
- Least Squares Method;
- Radio Astronomy;
- Sensitivity;
- Astronomy;
- Positions:Radio Sources;
- Proper Motions:Radio Sources;
- Radio Sources:VLB Interferometry