USNO CCD Astrograph Catalog explained

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]}

External links

• UCAC home page

Notes and References

1. Web site: UCAC5 - nowy katalog pozycji i ruchów własnych gwiazd . 2017-03-29 . pl.
2. https://arxiv.org/abs/1702.05621 UCAC5: New Proper Motions using Gaia DR1