Differences between UCAC3 and PPMXL in positions and proper motions, on an all-sky one-degree grid. At each gridpoint we give the differences X(PPMXL)- X(UCAC3) averaged over all stars in a sqrt(2)/2-degrees environment around the gridpoint given. The corrections given here should bring UCAC3 based astrometry to the ICRS.
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This service has an associated publication. If you use its data, it may be appropriate to reference 2010AJ....139.2184Z (ADS BibTeX entry for the publication) either in addition to or instead of the service reference.
To cite the service as such, we suggest the following BibTeX entry:
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@MISC{vo:UCAC3_ICRS_corr,
year=2009,
title={Corrections between {UCAC3} and {PPMXL}},
author={{GAVO} Data Centre},
url={https://dc.zah.uni-heidelberg.de/ucac3/q/corr/info},
howpublished={{VO} resource provided by the {GAVO} Data Center}
}