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 (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.
Note: The current version includes only the North (POSS-I plates)
Note: Zone -40/+50deg
(original column names in green) (1692919135 rows)
(original column names in green) (1811709771 rows)
Note: SDSS is also available from http://www.sdss.org/
Note: SDSS is also available from http://www.sdss3.org/dr9/
Note: The recommended designation for the 7C sources is made from the full B1950 position with template 7C HHMMSS.s+DDMMSS
Note: The column FIRST provides a link to the FIRST cutout image server (see also the original FIRST search engine)
Note: on-line documentation at http://www.swift.ac.uk/2SXPS/docs.php