USNO CCD Astrograph Catalog
The USNO CCD Astrograph Catalog (UCAC) is an astrometric star catalog of the United States Naval Observatory.
| Alternative names | UCAC |
|---|---|
| Survey type | star catalogue  |
| Published | October 2000 |
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]
gollark: ?
gollark: How often are there hatchlings in the AP?
gollark: Be sure to use Celestials, as they multiclutch, quadrupling egg output if you have enough.
gollark: You'll need to involve many people to make a dent.
gollark: You can tell those apart easily, I think those are the only eggs with "mana" in their description.
References
- "UCAC5 - nowy katalog pozycji i ruchów własnych gwiazd" (in Polish). 2017-03-29.
- UCAC5: New Proper Motions using Gaia DR1
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