The table of double stars contains orbital data for double star systems in the table of bright stars which fit the following criteria: the pair contains the primary star, components have a separation > 3.0" and differential visual magnitude < 3 magnitudes.
A few other systems of interest are also present. Data given are the most recent measure except where predicted positions are given based on orbit or rectilinear motion calculations.
The list was provided by Brian Mason and taken from the Washington Double Star Catalog (WDS, Mason, B.D. et al., Astron. Jour., 122, 3466, 2001); also available at http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/double-stars/.
The positions are for those of the primary stars and taken directly from the table of bright stars.
The ''primary'' is not necessarily the brighter object, but designates which object is the origin of measurements.
The Discoverer Designation contains the reference for the measurement from the WDS and the Epoch column gives the year of the measurement.
The visual magnitude of the primary is Tycho V-band except where indicated by an asterisk. The relative magnitude in the visual band between the two components is also given.