USNO CCD Astrograph Catalog

The USNO CCD Astrograph Catalog (UCAC) is an astrometric star catalog of the United States Naval Observatory.

First USNO CCD Astrograph Catalog
Alternative namesUCAC
Survey typestar catalogue Edit this on Wikidata
PublishedOctober 2000 Edit this on Wikidata


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.


The second issue was the IAU published General Assembly in Sydney (2003) and includes positions and proper motions of about 50 million stars.


The third edition was published in the IAU General Assembly in Rio (August 2009).


The fourth edition was published in August 2012.

Since Spring 2015, the successor URAT is available.


The fifth edition was published in February 2017.[1][2]


  1. ^ "UCAC5 - nowy katalog pozycji i ruchów własnych gwiazd" (in Polish). 2017-03-29.
  2. ^ UCAC5: New Proper Motions using Gaia DR1

External linksEdit