  Astrometry, on the International Celestial Reference Frame (epoch J2000.0),
is presented for the Walker (1994, PASP, 106, 828) stars in the Omega Centauri
(= NGC 5139 = C1323-1472) Hubble Space Telescope Wide Field/Planetary Camera
(WF/PC) calibration field of Harris et al. (1993, AJ, 105, 1196). Harris et al.
stars were first identified on a WFPC2 observation of the omega Cen HST
calibration field. Relative astrometry of the Walker stars in this field was
then obtained using Walker's CCD positions and astrometry derived using the
STSDAS METRIC task on the positions of the Harris et al. stars on the WFPC2
observation. Finally, the relative astrometry, which was based on the HST Guide
Star Catalog, is placed on the International Celestial Reference Frame with
astrometry from the USNO-A2.0 catalog. An ASCII text version of the astrometric
data of the Walker stars in the omega Cen HST calibration field is available
electronically in the online version of the article.
