VLBI OBSERVATIONS WITH EASTERN-HEMISPHERE ANTENNAS

Results are offered from VLBI observations of astronomical objects usi ng left-circular polarizaton at a wavelength of 18 cm and eastern hemi sphere antennas and the European VLBI network, as well as antennas at Ussuriisk, Bear Lakes, and Evpatoriya. A noise sensitivity of 4 mJy wa s achieved. Geocentric coordinates of the domestic observation points were determined to an accuracy of several meters. The limiting angular resolution was 5 mas. The major portion of W 51 maser emission was fo und to be concentrated in a region less than 50 mas in size. The princ ipal maser components have LSR velocities in the range 58.0-59.5 km/se c, flux densities of 40-80 Jy, and line widths of 0.37-0.50 km/sec.