Astronomy:USNO CCD Astrograph Catalog
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The USNO CCD Astrograph Catalog (UCAC) is an astrometric star catalog of the United States Naval Observatory.
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.[1][2]
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