/ftp/cats/I/322A



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I/322A              UCAC4 Catalogue                 (Zacharias+, 2012)
The UCAC4 subdirectory contains the original files (data, documentation
and access programs) patched with the January 2013 update.
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=I/322A
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drwxr-xr-x 317 cats archive 8192 Feb 28 11:16 [Up] drwxr-xr-x 3 cats archive 4096 Jul 25 2023 [TAR file] -rw-r--r-- 1 cats archive 498 Dec 19 2022 .message -r--r--r-- 1 cats archive 19366 Mar 5 2013 ReadMe drwxr-xr-x 7 cats archive 244 Sep 1 2013 UCAC4 -rw-r--r-- 1 cats archive 1005 Jan 31 2013 +footg5.gif -r--r--r-- 1 cats archive 11211 Jan 7 2013 +footg5.png -rw-r--r-- 1 cats archive 2978 Jan 31 2013 +footg8.gif -r--r--r-- 1 cats archive 97630 Jan 7 2013 +footg8.png -r-xr-xr-x 1 cats archive 180741 Feb 6 2013 modif3.py -rwxr-xr-x 1 cats archive 177037 Jan 28 2013 modifs.py -r--r--r-- 1 cats archive 80123 Aug 8 2012 out.sam.gz [Uncompressed] -r--r--r-- 1 cats archive 94310 Sep 21 2012 ucac4doc.txt -rw-r--r-- 1 cats archive 2038 Feb 6 2013 ucac4fix.html -r--r--r-- 1 cats archive 1694 Feb 6 2013 ucac4fix.htx
Beginning of ReadMe : I/322A UCAC4 Catalogue (Zacharias+, 2012) ================================================================================ The fourth U.S. Naval Observatory CCD Astrograph Catalog (UCAC4) Zacharias N., Finch C.T., Girard T.M., Henden A., Bartlett J.L., Monet D.G., Zacharias M.I. <Astron. J. 145, 44 (2013)> =2012yCat.1322....0Z =2013AJ....145...44Z ================================================================================ ADC_Keywords: Surveys ; Positional data ; Proper motions Description: UCAC4 is a compiled, all-sky star catalog covering mainly the 8 to 16 magnitude range in a single bandpass between V and R. Positional errors are about 15 to 20 mas for stars in the 10 to 14 mag range. Proper motions have been derived for most of the about 113 million stars utilizing about 140 other star catalogs with significant epoch difference to the UCAC CCD observations. These data are supplemented by 2MASS photometric data for about 110 million stars and 5-band (B,V,g,r,i) photometry from the APASS (AAVSO Photometric All-Sky Survey) for over 50 million stars. UCAC4 also contains error estimates and various flags. All bright stars not observed with the astrograph have been added to UCAC4 from a set of Hipparcos and Tycho-2 stars. Thus UCAC4 should be complete from the brightest stars to about R=16, with the source of data indicated in flags. UCAC4 also provides a link to the original Hipparcos star number with additional data such as parallax found on a separate data file included in this release. The proper motions of bright stars are based on about 140 catalogs, including Hipparcos and Tycho, as well as all catalogs used for the Tycho-2 proper motion construction. Proper motions of faint stars are based on re-reductions of early epoch SPM data (-90 to about -20 deg Dec) and NPM (PMM scans of early epoch blue plates) for the remainder of the sky. These early epoch SPM data have also been combined with late epoch SPM data to arrive at proper motions partly independent from UCAC4 (Girard et al. 2011AJ....142...15G, Cat. I/320). The NPM data used in UCAC4 are not published. No Schmidt plate data are used in UCAC4. The unpublished plate measure data obtained by StarScan from the AGK2, the Hamburg Zone Astrograph, the USNO Black Birch Astrograph, and the Lick Astrograph have contributed to considerable improvement in proper motions for stars mainly in the 10 to 14 mag range (down to the UCAC limit for Lick data); however, these data do not cover all sky. Recources permitting, USNO plans to release the individual CCD observations (RA,Dec at epoch of each CCD observations) in the future. Please contact if you are interested in obtaining this set of about 50 GB data. We will likely request that interested users provide an external disk drive for the data release. Acknowledging UCAC4: The paper (Zacharias et al., 2013, AJ, 145, 44) should be cited whenever UCAC4 data is utilized.