A copy of this work was available on the public web and has been preserved in the Wayback Machine. The capture dates from 2018; you can also visit the original URL.
The file type is
We describe the use of the Lick Northern Proper Motion NPM program and its southern-sky complement , the YaleeSan Juan Southern Proper Motion SPM program to determine the Hipparcos proper-motion link to the extragalactic reference system de-ned by galaxies. Particular attention is given to the presence of systematic errors in the NPM and SPM proper motions which bias the spin solutions.fatcat:fuujt62uxnhefb65et75rw3fei