Three IVS research and development experiments were observed in order to
detect terms proportional to (v/c)**3 in gravitational delay caused by the
Jupiter when it passed within 3.7 arcmin from the quasar 0839+187. Preliminary
results of group delay analysis are presented. The estimate of parameter
gamma for gravitation delay in the Jovian gravitational field
1.2 -+ 0.1 was determined.