The time spans of the data sets are too short compared to the fitted periods (5 to 12 y), however, to reliably establish periodicity. Roughly half of the heavily observed jets show systematic position angle trends with time, and 20 show indications of oscillatory behavior. The BL Lac jets show smaller variations than quasars. Nearly all of the 60 most heavily observed jets show significant changes in their innermost position angle over a 12 to 16 year interval, ranging from 10° to 150° on the sky, corresponding to intrinsic variations of ~ 0.5° to ~ 2°. We describe the parsec-scale kinematics and statistical polarization properties of 200 AGN jets based on 15 GHz VLBA data obtained between 1994 Aug May 1. Lister a for the MOJAVE collaborationĭepartment of Physics, Purdue University, 525 Northwestern Avenue West Lafayette, IN, 47907, U.S.A.
