33 Doubles - e-mail group for double star discussions

33 Doubles - 33 Doubles projects page

U.S. Naval Observatory's Double Star Library - Extensive library of double stars,including        binary, variable, many useful catalog links are included.

Astronomical League's Double Star Club- A.L. double star list, log sheet, and certificate.

Double Stars Astrophotos - A collection of double stars pics

Binary Stars - Theoretical introduction about double stars, chronometric micrometer, angular micrometer, measurements, bibliography, etc.

The CDS Service for astronomical Catalogues - Data, data and more data from a lot of catalogs.

The Saguaro Astronomy Club's Double Star Database - A list that contains information on over 10,000 multiple star systems.

The Visual Binaries List: The Widest 100 - A list of 100 beautiful doubles including orbit maps

Hanwell Community Observatory's "Double Stars" discussion - A nice discussion on measuring double stars

The Prairie Astronomy Club's "Double Stars to Follow" - A thorough five part discussion of doubles of interest.

Besançon Double and Multiple Star Database - Very interesting database of double stars.

Webb Society - The main purpose of the Society is to encourage amateur observations of double stars

85 Double, Multiple, and Stars of Unusual Color - Sorted by constellation. Object list derived from DeepMap 600, copyright (c) 1997 Orion Telescopes & Binoculars

Dawes Limit Calculator - Calculates the Dawes Limit, the resolution of double stars in arcseconds, for any size telescope

Washington Double Star Catalog (WDS) - Washington Double Star Catalog

Bedford Catalogue - Admiral William H. Smyth's Bedford Catalogue from "A Cycle Of Celestial Objects"

Observing double stars - About observing double stars

Astrometry & Dynamics: Double & Multiple Stars. Royal Observatory of Belgium (Brussels) - Welcome to the world of double and multiple stars.

The Hipparcos Space Astrometry Mission - The ESA Hipparcos site. Much of enormous value for double-star observers.

The Orbital Elements of selected visual binaries - For the mathematically minded.

The Double Star Observer - This is the site of Robert Tanguay's 'Double Star Observer' Newsletter

The Tycho-2 Catalogue Information and Links - The Tycho 2 catalogue. Indispensable for researching wide, faint or otherwise obscure pairs

Akira Inaka's website - In Japanese for the most part and therefore difficult to navigate, but full of magnificent double star images. ( Click on "Deep Sky", then on blue links in right column; click on constellation abbreviation in left column and then click on double star in constellation image)

Matthias Juchert's double star website - info and images of popular double stars (German)

(Images and text may be used with written permission of the author)