The USNO-B1.0 Catalog
(Entry Format) (B1.0 at USNO)

WCSTools Catalogs
Authors: D. Monet, S. Levine, B. Canzian, H. Ables, A. Bird, C. Dahn, H. Guetter, H. Harris, A. Henden, S. Leggett, H. Levison, C. Luginbuhl, J. Martini, A. Monet, J. Munn, J. Pier, A. Rhodes, B. Riepe, S. Sell, R. Stone, F. Vrba, R. Walker, G. Westerhout, R. Brucato, N. Reid, W. Schoening, M. Hartley, M. Read, S. Tritton

Documented in this Astronomical Journal paper

USNO-B is an all-sky catalog that presents positions, proper motions, magnitudes in various optical passbands, and star/galaxy estimators for 1,042,618,261 objects derived from 3,643,201,733 separate observations. The data were obtained from scans of 7,435 Schmidt plates taken for the various sky surveys during the last 50 years. USNO-B1.0 is believed to provide all-sky coverage, completeness down to V = 21, 0.2 arcsecond astrometric accuracy at J2000, 0.3 magnitude photometric accuracy in up to five colors, and 85% accuracy for distinguishing stars from non-stellar objects.

The catalog's size is about 80 GBytes and the only way to get it is to make a copy from someone who already has it.

It can be searched at Flagstaff at

Map of B1.0 catalog on entire sky

Software for searching the USNO-B1.0 is in WCSTools from release 3.3.0 onward.
scat (sub1) searches the catalog by sky location or number.
imcat (imub1) lists the objects in the region covered by a FITS or IRAF image with world coordinate system (WCS) information in its header.
imwcs (imwub1) fits a WCS to a FITS or IRAF image using the USNO-B1.0 as a reference.

[Distributed B1.0 Format] [B1.0 at USNO] [USNO-A2.0 Catalog]