)<br>
</center></H3><br><br>

This catalog continues the series of compilations of visual binary star orbits previously 
published by Finsen (1934, 1938), Worley (1963), Finsen & Worley (1970), Worley & Heintz 
(1983), and most recently by Hartkopf, Mason, & Worley (2001) in their Fifth Catalog of 
Orbits of Visual Binary Stars.  That catalog, containing orbits published through 1 
January 2001, was one of four double star catalogs maintained at the USNO that were 
written to CD-ROM in 2001 and distributed. The 30 June 2006 edition of the Sixth Catalog 
was included on the second USNO Double Star CD-ROM, which is available upon request.

The <i>Fifth Catalog</i> was removed from the web in August 2007, as it had long been
supplanted by the <i>Sixth Catalog</i>.  </font>
<br><br>

As of the above date, the <i>Sixth Catalog</i> included