Plan for VLBI observations of close approaches of Jupiter to compact
  extragalactic radio sources in 2014-2016
  Very Long Baseline Interferometry is capable of measuring the gravitational
delay caused by the Sun and planet gravitational fields. The post-Newtonian
parameter $\gamma$ is now estimated with accuracy of $\sigma_{\gamma}=2\cdot
10^{-4}$ using a global set of VLBI data from 1979 to present (Lambert,
Gontier, 2009), and $\sigma_{\gamma}=2\cdot10^{-5}$ by the Cassini spacecraft
(Bertotti et. al, 2003). Unfortunately, VLBI observations in S- and X-bands
very close to the Solar limb (less than 2-3 degrees) are not possible due to
the strong turbulence in the Solar corona. Instead, the close approach of big
planets to the line of sight of the reference quasars could be also used for
testing of the general relativity theory with VLBI. Jupiter is the most
appropriate among the big planets due to its large mass and relatively fast
apparent motion across the celestial sphere. Six close approaches of Jupiter
with quasars in 2014-2016 were found using the DE405/LE405 ephemerides,
including one occultation in 2016. We have formed tables of visibility for all
six events for VLBI radio telescopes participating in regular IVS programs.
Expected magnitudes of the relativistic effects to be measured during these
events are discussed in this paper.
