Note: USNO-A1.0 contains 488,006,860 sources, and was compiled from the blue/red overlaps of the detection lists generated from scans of POSS-I O and E plates (>=-30°) and SRC-J and ESO-R plates (<=-35°). USNO-A1.0 was created by Dave Monet () and collaborators at Flagstaff Station, U.S. Naval Observatory; it is superseded by the new PMM-USNO-A2.0 version.
The VizieR search engine uses an on-line compressed version (3.4Gbytes) which was generated at CDS.

I/243/out

The PMM USNO-A1.0 Catalogue (Monet 1997) ReadMe+ftp metaI/243/out The Full Catalogue (488006860 rows) (Note)

I/350/comscanl

Gaia EDR3 (Gaia Collaboration, 2020) ReadMe+ftp 2021A&A...649A...1G metaI/350/comscanl *Representation of the Gaia scanning law over the 34 month time period covered by the Gaia Data Release 3 (original column names in green) (8967691 rows) (Note)