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 (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it is superseded by the new PMM-USNO-A2.0 version.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.
© Université de Strasbourg/CNRS