Open AccessThe Second US Naval Observatory CCD Astrograph Catalog (UCAC2)
Author(s) -
N. Zacharias,
S. E. Urban,
M. I. Zacharias,
G. L. Wycoff,
David Hall,
D. G. Monet,
T. J. Rafferty
Publication year - 2004
Publication title -
the astronomical journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.61
H-Index - 271
eISSN - 1538-3881
pISSN - 0004-6256
DOI - 10.1086/386353
Subject(s) - declination , observatory , magnitude (astronomy) , physics , sky , photometry (optics) , stars , astrometry , apparent magnitude , proper motion , astronomy , epoch (astronomy) , astrophysics , geodesy , remote sensing , geography
The second USNO CCD Astrograph Catalog, UCAC2 was released in July 2003.Positions and proper motions for 48,330,571 sources (mostly stars) areavailable on 3 CDs, supplemented with 2MASS photometry for 99.5% of thesources. The catalog covers the sky area from -90 to +40 degrees declination,going up to +52 in some areas; this completely supersedes the UCAC1 released in2001. Current epoch positions are obtained from observations with the USNO8-inch Twin Astrograph equipped with a 4k CCD camera. The precision of thepositions are 15 to 70 mas, depending on magnitude, with estimated systematicerrors of 10 mas or below. Proper motions are derived by utilizing over 140ground-and space-based catalogs, including Hipparcos/Tycho, the AC2000.2, aswell as yet unpublished re-measures of the AGK2 plates and scans from the NPMand SPM plates. Proper motion errors are about 1 to 3 mas/yr for stars to 12thmagnitude, and about 4 to 7 mas/yr for fainter stars to 16th magnitude. Theobservational data, astrometric reductions, results, and important informationfor the users of this catalog are presented.Comment: accepted by AJ, AAS LaTeX, 14 figures, 10 table
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