Paper:	Astrometry with VSOP
Volume:	402, Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technologies
Page:	486
Authors:	Rioja, M.; Porcas, R.; Dodson, R.; Asaki, Y.
Abstract:	Phase referencing has proved to be a useful technique for astronomical ground-based VLBI. We successfully carried out Space–VLBI phase referencing observations for the first time, using VSOP at 5 and 1.6GHz, and we report here the astrometric results. We also made a direct measure of the orbit uncertainties. In addition we present a new calibration method for mm–VLBI astrometry, source/frequency phase referencing, valid under a wider variety of conditions than conventional phase referencing. Its requirements are compatible with the VSOP-2 mission specifications and would expand its capabilities.

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