A Deep Proper-Motion Survey in Kapteyn Selected Areas: I. Survey   Description and First Results for Stars in the Tidal Tail of Sagittarius and   in the Monoceros Ring
  We describe a high-precision, deep (to V ~ 19-21) absolute proper-motion survey that samples ~50 lines of sight in the Kapteyn Selected Areas along declination zones -15, 0 and 15 degrees. In many fields the astrometric baseline reaches nearly a century. We demonstrate that these data provide typical per star precisions between ~ 1 and 3 mas/yr to the above magnitude limits, with the absolute reference frame established by numerous extragalactic sources in each survey field. Combined with existing and ongoing photometric and radial velocity surveys in these fields, these astrometric data will enable, among other things, accurate, detailed dynamical modeling of satellite interactions with our Galaxy. In this contribution we describe the astrometric part of our survey and show preliminary results along the trailing tail of the Sagittarius dwarf galaxy, and in the Monoceros ring region. 
Dana I. Casetti-Dinescu, Steven R. Majewski, Terrence M. Girard,   Jefferey L. Carlin, William F. van Altena, Richard J. Pat...