{{Short description|Astronomical catalog}} {{Multiple issues|{{more footnotes needed|date=October 2015}}{{more citations needed|date=October 2015}}}}
{{Infobox astronomical survey}} The '''USNO CCD Astrograph Catalog''' (UCAC) is an astrometric star catalog of the United States Naval Observatory.
{| class="wikitable" ! Edition ! Description |- | UCAC-1 | The first preliminary edition, published in March 2000, gives the positions and proper motions of over 27 million stars in the southern hemisphere in the brightness range 8–16. |- | UCAC-2 | The second issue was the IAU published General Assembly in Sydney (2003) and includes positions and proper motions of about 50 million stars. |- | UCAC-3 | The third edition was published in the IAU General Assembly in Rio (August 2009). |- | UCAC-4 | The fourth edition was published in August 2012. Since Spring 2015, the successor URAT is available. |- | UCAC-5 | The fifth edition was published in February 2017.<ref>{{cite web | url = http://www.urania.edu.pl/wiadomosci/ucac5-nowy-katalog-pozycji-ruchow-wlasnych-gwiazd-3220.html | title = UCAC5 - nowy katalog pozycji i ruchów własnych gwiazd | date = 2017-03-29 | language = pl}}</ref><ref>[https://arxiv.org/abs/1702.05621 UCAC5: New Proper Motions using Gaia DR1]</ref> |}
==References== <!--This article uses the Cite.php citation mechanism. If you would like more information on how to add references to this article, please see http://meta.wikimedia.org/wiki/Cite/Cite.php --> {{Reflist|30em}}
==External links== *[https://web.archive.org/web/20090414135851/http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/ucac UCAC home page] *[https://cdsarc.cds.unistra.fr/ftp/I/322A/ UCAC4 in the vizier database] *[https://cdsarc.cds.unistra.fr/ftp/I/340/ UCAC5 in the vizier database]
Category:Astronomical catalogues of stars
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