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: The chance of this happening randomly is quite low.
gollark: I mean, my A-level computer science cohort of 9 people contains exactly 0 (zero) women.
gollark: Yes. I think it's better to just ignore gender etc. where possible, and/or figure out exactly *why* there are fewer women doing things, rather than segregating later.
gollark: Only to WEAK mortal humans.
gollark: Palaiologos, go increase your bismuth concentration 304%.
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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