Information is also available for past projects.
Studies of its water masers have provided evidence for a thin molecular accretion disk bound by a massive central engine, and a high-precision estimate of geometric distance from the measurement of orbital proper motion and accelaration of disk material. Parallaxes of Ten Nearby Radio Pulsars Walter Brisken is a doctoral student at Princeton who has been using the VLBA to observe pulsars, gathering data for his doctoral thesis. He and his colleagues have demonstrated that effects of the ionosphere in pulsar observations can be removed by using certain observing techniques. The main goal of this observation is to increase the density of defining sources in the southern hemisphere. Because the emphasis is on the southern sky, only two VLBA antennas will be used in conjunction with antennas in West Virginia, Germany, and Brazil.