The USNO CCD Astrograph Catalog (UCAC) is an astrometric star catalog of the United States Naval Observatory.
First USNO CCD Astrograph Catalog| Alternative names | UCAC |
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| Edition
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Description
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| UCAC-1
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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.
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| UCAC-2
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The second issue was the IAU published General Assembly in Sydney (2003) and includes positions and proper motions of about 50 million stars.
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| UCAC-3
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The third edition was published in the IAU General Assembly in Rio (August 2009).
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| UCAC-4
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The fourth edition was published in August 2012. Since Spring 2015, the successor URAT is available.
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| UCAC-5
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The fifth edition was published in February 2017.[1][2]
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