USNO CCD Astrograph Catalog


The USNO CCD Astrograph Catalog 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 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.

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.