Absolute astrometry with ultra-wide bandwidth synthesis

An exploratory project for testing a novel, economical way to determine absolute position of radio sources with accuracy better than 0.1~mas utilizing recent upgrade of VLBI hardware. It was shown that the core-shift at 8 GHz is on average 0.2 mas. This sets the fundamental limit on astrometric accuracy. The objective of this campaign is to test the methodology that promises to overcome this limit. The novelty of the approach:


The goal of proposed observations is to assess the level of systematic errors and present evidence that claimed accuracy is achievable. If successful, the methodology of determination of absolute positions with accuracies 0.05–0.1mas for less than 1/2 hours per triplet will be developed. This will allow to refine on-demand positions of those sources for which this level of accuracy is necessary.


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This web page was prepared by Leonid Petrov ()
Last update: 2014.07.23_13:39:43