USNO CCD Astrograph Catalog

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

Versions

UCAC-1

The first preliminary edition, published in March 2000, contains positions and proper motions of over 27 million stars in the southern hemisphere in the magnitude of 8 to 16 mag .

UCAC-2

The second edition was published for the IAU General Assembly in Sydney (2003) and contains positions and movements of about 50 million stars.

UCAC-3

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

UCAC-4

The fourth edition was published in August 2012.

The first version of the URAT successor catalog has been available since spring 2015 .

Web links