1.2k citations · 2.2k across the 7 of their papers we have counts for
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astro-ph2004★ 615 cited
The second US Naval Observatory CCD Astrograph Catalog (UCAC2)
N. Zacharias, S. E. Urban, M. I. Zacharias +4
The second USNO CCD Astrograph Catalog, UCAC2 was released in July 2003. Positions and proper motions for 48,330,571 sources (mostly stars) are available on 3 CDs, supplemented wit…
astro-ph2000★ 19 cited
Comparing Tycho-2 Astrometry with UCAC1
Norbert Zacharias, Marion I. Zacharias, Sean E. Urban +1
The Tycho-2 Catalogue, released in February 2000, is based on the ESA Hipparcos space mission data and various ground-based catalogs for proper motions. An external comparison of t…
astro-ph1996★ 10 cited
The Twin Astrographic Catalog (TAC) Version 1.0
N. Zacharias, M. I. Zacharias, G. G. Douglass +1
A first version of the Twin Astrographic Catalog (TAC) of positions for 705,679 stars within has been produced. The sky coverage of the TAC is com…