... EVN

The European VLBI Network is a joint facility of European, Chinese, South African and other radio astronomy institutes funded by their national research councils.

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... VLBA

The VLBA is a facility of the NRAO, which is operated by Associated Universities, Inc., under contract with the NSF.

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... subtracted

The contribution of the parallax and source motion relative to the Sun have been calculated with a program kindly provided by Prof. Tetsuo Sasao. Both a flat galactic rotation curve and the rotation curve of Brand & Blitz (1993) have been considered, but the results obtained for a distance of 1.7 kpc were not significantly different.

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... antenna

The Medicina VLBI radiotelescope is operated by the INAF-Istituto di Radioastronomia.

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