Primary source of data on any double star. Suggested lists of neglected and unconfirmed pairs for observing. Current version of the orbital catalogue (Sixth) is at http:// ad.usno.navy.mil/wds. Third speckle catalogue CD-ROM (June 2001) can be obtained by e-mail or post from: Dr. Brian D. Mason , Project Manager, Washington Double Star Program, Astrometry Department, US Naval Observatory, 340 Massachusetts Avenue NW, Washington DC 20392-5420, phone: 202-762-1412 fax: 202-762-1516 email: [email protected] usno.navy.mil.
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