Dictionary of Nomenclature of Celestial Objects
(Last update: 15-Sep-2014)

Result of query: info cati UCAC3$

Details on Acronym:   UCAC3
   UCAC3 (Third USNO CCD Astrograph Catalog)= (3UCAC) = (3UC) Write:<<UCAC3 FFF-NNNNNN>> N: 100765502 Object:*  (SIMBAD class: Star) Note:UCAC3 is a compiled, all-sky star catalog covering mainly the 8 to 16 magnitude range in a single bandpass between V and R. 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. Ref:=2009yCat.1315....0Z byZACHARIAS N. , FINCH C., GIRARD T., HAMBLY N., WYCOFF G., ZACHARIAS M.I., CASTILLO D., CORBIN T., DI VITTORIO 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. CDS/ADC Collection of Electronic Catalogues, 1315, 0 (2009) Third U.S. Naval Observatory CCD Astrograph Catalog (UCAC3) o<UCAC3 FFF-NNNNNN> N=100765502. Ref:=2010AJ....139.2184Z byZACHARIAS N. , FINCH C., GIRARD T., HAMBLY N., WYCOFF G., ZACHARIAS M.I., CASTILLO D., CORBIN T., DI VITTORIO 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, 2184-2199 (2010) The third US Naval Observatory CCD Astrograph Catalog (UCAC3). o<UCAC3 FFF-NNNNNN> N=100765502. =E=Catalogue in electronic form as I/315 Originof the Acronym: A = Assigned by the author(s)

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