Note: Note that the J2000 coordinates are not part of the original catalogue, they were computed from dRAs and dDEs, or from the (rho,theta); their accuracy can be low.
The USNO-B Catalog presents positions, proper motions,
magnitudes un blue, red and infrared, as well as star/galaxy estimators
for 1,045,175,762 objects derived from 3,648,832,040 separate observations.
The data were taken from scans of 7,435 Schmidt plates
taken from various sky surveys during the last 50 years.
USNO-B1.0 catalog was created by Dave Monet and collaborators
Note that the star/galaxy estimators may be mixed up
in dense regions.
Note: More recent versions available: UCAC3 (I/315) and UCAC4 (I/322); see also the UCAC home page at http://ad.usno.navy.mil/ucac/
The Naval Observatory Merged Astrometric Dataset (NOMAD) contains
astrometric and photometric data for over 1 billion stars derived from
the Hipparcos (I/239), Tycho-2 (I/259), UCAC2 (I/289), and USNO-B1.0
(I/284) catalogs for astrometry and optical photometry, supplemented
by 2MASS (II/246) near-infrared photometry.
An efficient remote query program findnomad1 is
available in the cdsclient
package, for Unix/Linux platforms
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.
Note: Many errors detected in the positions given in the catalogue, especially in the sign of the declination in the zones -1°<δ<+1°
Note: SDSS is also available from http://www.sdss3.org/dr9/
Note: The column expnum provides an access to details on the exposures, and a link to the Preview and Retrieval System via the CADC
Note: Details of surveyed literature