Arcsecond positions for milliarcsecond VLBI nuclei of extragalactic radio soures. Part 1. 546 sources
Very long Baseline Interferometry measurements at 2290 MHz on baselines of approximately 10 to the 4th power km between Deep Space Network stations were used to identify sources that are suitable for precision astrometric applications. The use of relatively crude time delay measurements along with fringe frequency measurements to determine the positions of the milliarcsecond nuclei in 546 extragalactic sources with accuracies of generally approximately 1' is described. The calculated positions of the sources and the corresponding uncertainties are presented and the positions are referenced to the equinox of 1950.0 and elliptical aberration terms are included so as to agree with past astronomical convention. The source positions and position uncertainties for sources which were multiply observed were estimated from a weighted average. The reliability of the determined positions was demonstrated by testing the repeatability of multiple observations on the same source and by position comparisons with more accurate radio catalogs.
- Research Organization:
- Jet Propulsion Lab., Pasadena, CA (USA)
- OSTI ID:
- 6815314
- Report Number(s):
- N-82-16109; TRN: 82-024199
- Resource Relation:
- Other Information: In Telecommunications and data acquisition report, 15 December 1981, pp 37-48 see N82-16101
- Country of Publication:
- United States
- Language:
- English
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