/ftp/cats/aliases/V/./VIPS_1_



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J/AJ/142/89         VLBA Galactic Plane Survey. VGaPS.       (Petrov+, 2011)
The following files can be converted to FITS (extension .fit or fit.gz)
	table2.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=J/AJ/142/89
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Beginning of ReadMe : J/AJ/142/89 Precise astrometry with VLBA (VIPS) (Petrov+, 2011) ================================================================================ Precise absolute astrometry from the VLBA imaging and polarimetry survey at 5 GHz. Petrov L., Taylor G.B. <Astron. J., 142, 89 (2011)> =2011AJ....142...89P ================================================================================ ADC_Keywords: Positional data ; VLBI ; Fundamental catalog ; Radio sources Keywords: astrometry - catalogs - surveys Abstract: We present accurate positions for 857 sources derived from the astrometric analysis of 16 eleven-hour experiments from the Very Long Baseline Array imaging and polarimetry survey at 5GHz (VIPS). Among the observed sources, positions of 430 objects were not previously determined at milliarcsecond-level accuracy. For 95% of the sources the uncertainty of their positions ranges from 0.3 to 0.9mas, with a median value of 0.5mas. This estimate of accuracy is substantiated by the comparison of positions of 386 sources that were previously observed in astrometric programs simultaneously at 2.3/8.6GHz. Surprisingly, the ionosphere contribution to group delay was adequately modeled with the use of the total electron content maps derived from GPS observations and only marginally affected estimates of source coordinates. Description: The VIPS position catalog presents coordinates of 857 target sources observed with the Very Long Baseline Array at 5GHz. The catalogue contains the following information: source positions, their inflated uncertainties and correlation coefficients between right ascension and declination; the number of observations used; the total correlated flux density computed as a sum of all CLEAN components and its uncertainty; and the correlated flux density of the unresolved component computed as the median of correlated flux density values measured different projected spacings at 5, 8.4, 15, and 22GHz.