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 USNO-A1.0 was created by Dave Monet () and collaborators at Flagstaff Station, U.S. Naval Observatory; it is superseded by the new PMM-USNO-A2.0 version.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)

Note: USNO-A2.0 contains 526,280,881 sources, and is based on a re-reduction of the Precision Measuring Machine (PMM) scans from POSS-I O and E plates (>=-18°) and SRC-J and ESO-R plates (<=-20°). USNO-A2.0 was created by Dave Monet () and collaborators at Flagstaff Station, U.S. Naval Observatory.
The major difference between USNO-A2.0 and its previous version USNO-A1.0 is that A1.0 used the Guide Star Catalog as its reference frame whereas A2.0 uses the ICRF as realized by the USNO ACT catalog (Urban et al. 1997). The VizieR search engine uses an on-line compressed version (3.6Gbytes) which was generated at CDS.

I/252/out

The USNO-A2.0 Catalogue (Monet+ 1998) ReadMe+ftp metaI/252/out The Full Catalogue (526280881 rows) (Note)

Note:

II/363/unwise

The band-merged unWISE Catalog (Schlafly+, 2019) ReadMe+ftp 2019ApJS..240...30S metaII/363/unwise The band-merged unWISE catalog (original column names in green) (2214734224 rows)

II/365/catwise

The CatWISE2020 catalog (updated version 28-Jan-2021) (Marocco+, 2021) ReadMe+ftp 2021ApJS..253....8M metaII/365/catwise The CatWISE2020 catalog (original column names in green) (1890715640 rows)