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: This version of the
has no proper motions, but the limits on brightness which existed on
GSC2.2 (F<18.5, Bj<19.5) were removed.
(original column names in green) (1692919135 rows)
Note: SDSS is also available from http://www.sdss.org/
Note: please credit the usage of the UKIDSS data (details at http://www.ukidss.org/archive/archive.html)
Note: please acknowledge the usage of the CFHTLS Survey
Note: SDSS is also available from http://www.sdss3.org/dr9/
Note: A custom set of five medium-bandwidth filters in the wavelength range
of 1-1.8µm was fabricated for the NEWFIRM camera on Mayall for the
NEWFIRM Medium-Band Survey (NMBS).
The J1 band is similar to the Y band,
the canonical J band is split into two filters, J2 and J3,
and the H band is split into two filters, H1 and H2
(see the top panel in Figure 1 of the paper).
© Université de Strasbourg/CNRS