Sixth Catalog of Orbits of Visual Binary Stars
(catalog updated frequently)
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 Fifth Catalog was removed from the web in August 2007, as it had long been supplanted by the Sixth Catalog.
As of 6 November 2013, the Sixth Catalog included 2,428 orbits of 2,328 systems (from a "master file" database currently containing 7,301 orbits). All orbits have been graded on a 1 - 5 scale, as in earlier catalogs; the grading scheme has been modified, however, as described below. Ephemerides are included for all orbits with complete elements, as are plots including all associated data in the current Washington Double Star database.
2005 Mar: The format of the catalog was extensively modifed. A description of the new format is given here
2007 Aug/Sep: Orbit catalog notes were merged with those of the Washington Double Star Catalog and later the Fourth Interferometric Catalog, in order to create a common notes file (and file format) for all USNO double star catalogs. Cleanup of old notes is never really completed, of course - we welcome notification of any errors you may run across.
2013 Aug: A version of the elements file was created which includes delimiters, for those users who work with SQL-type databases. This is a work in progress - please let us know of any problems with this file.
2013 Nov: A link was added to the "master file" database of all orbits. A few comments are in order. First, the grade (col. 244-246) is here a decimal; the range of grades is 0.0 - 5.5 (rounded to an integer value in the main catalog) and differences in grade of a few tenths are usually insignificant. A grade of 6.6 is given for orbits considered too old to be worth grading; values of 8.0 are reserved for interferometric orbits lacking rho/theta information; values of 9.0 are reserved for astrometric orbits. Column 248 is a flag indicating a note, while column 250 is a yes/no flag indicating the solution considered currently "best".
- Orbit grading method
- Description of the catalog
- Catalog statistics
- Acknowledgments and references
- Orbital elements (frames version)
- Orbital elements (noframes version)
- Orbital elements (text version)
- Orbital elements (text version with delimiters)
- Formats of elements and ephemerides files (text versions)
- Calibration Candidates
- Top 25 Orbit Calculators
- "Master file" database
Your comments regarding either style or substance are welcome. Please inform the authors of any errors you run across in the catalog, as well as missing orbits, etc. We would also welcome notification (and/or copies) of any newly published elements.