/ftp/cats/aliases/U/UCAC3



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I/315   ==OBSOLETE version of Catalogue==
01-Oct-2012: (by Francois Ochsenbein) See I/322
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=I/315
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drwxr-xr-x 317 cats archive 8192 Feb 28 11:16 [Up] drwxr-xr-x 3 cats archive 4096 Jun 29 2023 [TAR file] -rw-r--r-- 1 cats archive 388 Dec 19 2022 .message -rw-r--r-- 1 cats archive 48 Oct 1 2012 =obsolete= -r--r--r-- 1 cats archive 16411 Jul 28 2010 ReadMe drwxr-xr-x 2 cats archive 12288 Apr 26 2011 UCAC3 -rw-r--r-- 1 cats archive 1005 Jul 27 2010 +footg5.gif -rw-r--r-- 1 cats archive 11627 May 6 2012 +footg5.png -rw-r--r-- 1 cats archive 2978 Jul 27 2010 +footg8.gif -rw-r--r-- 1 cats archive 97321 May 6 2012 +footg8.png -rw-r--r-- 1 cats archive 1752 Feb 9 2010 dic1315.tst -r--r--r-- 1 cats archive 25642 Sep 9 2009 out.sam -r--r--r-- 1 cats archive 54600 Aug 12 2009 ucac3doc.txt
Beginning of ReadMe : I/315 UCAC3 Catalogue (Zacharias+ 2009) ================================================================================ Third U.S. Naval Observatory CCD Astrograph Catalog (UCAC3) Zacharias N., Finch C., Girard T., Hambly N., Wycoff G., Zacharias M.I. , Castillo D., Corbin T., DiVittorio M., Dutta S., Gaume R., Gauss S., Germain M. , Hall D., Hartkopf W., Hsu D., Holdenried E., Makarov V. , Martines M. , Mason B., Monet D., Rafferty T., Rhodes A., Siemers T., Smith D., Tilleman T., Urban S., Wieder G., Winter L., Young A., <Astron. J. 139, 2184 (2010)> =2010AJ....139.2184Z ================================================================================ ADC_Keywords: Surveys ; Positional data ; Proper motions Description: UCAC3 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. It is supplemented by proper motions and SuperCosmos and 2MASS photometric data, as well as various flags. 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 a re-reduction of early epoch SPM data (-90 to -10 deg Dec) plus Schmidt plate data from the SuperCosmos project (down weighted due to systematic errors of order 100 mas). The proper motions of faint stars (R >= 13.5) therefore should be used with caution. The unpublished plate measure data from the AGK2, the Hamburg Zone Astrograph, the USNO Black Birch Astrograph, and the Lick Astrograph have considerably contributed to improve proper motions for stars mainly in the 10 to 14 mag range (down to the UCAC3 limit for Lick data); however, these data do not cover all sky. UCAC3 features a number of major differences with respect to UCAC2: - complete sky coverage - re-reduction of the pixel data with better modeling - double stars are resolved to the limit of the data - significantly improved photometry from CCD data - slightly deeper limiting magnitude with larger number of stars/area - reduced systematic errors of CCD observations - the addition of several new catalogs for improved proper motions - photometry in the B, R, and I bands from the SuperCosmos project - minor planet observations have been sorted out - identification of more high proper motion stars - match with 2MASS extended sources and LEDA galaxies Additional details will be published in the upcoming release paper (Zacharias et al. 2009) and in several technical papers describing details of the reduction procedures and results. For the latest updates see http://www.usno.navy.mil/usno/astrometry . Requests for the data DVD should be sent to ; technical questions can be addressed to . Acknowledging UCAC3: The release paper (Zacharias et al. 2009) should be cited whenever UCAC3 data is utilized.