Find questions answered about binary stars. Includes how to detect them, the percentage of stars that are binary and whether they have planets.
Check out the Astronomical League Double Star Club's list of top double stars for observing. Includes a link to the main club page.
Check out the Royal Observatory of Belgium's guide to double and multiple stars. Learn about the CCD technique and the Hipparcos mission.
Astronomical League club introduces observers to 100 of the best double and multiple stars in the sky. Includes an observing list and log sheet.
Learn about the 1993 Nobel-Prize-winning discovery by Russell Hulse and Joseph Taylor of this pulsar in a binary orbit with another star.
Discover facts about this class of stars that share a common orbit. Includes details about visual, spectroscopic and eclipsing binaries
Find a student guide to binary stars. Learn about the differences between visual, eclipsing, spectrum, spectroscopic and contact binaries.
Library houses information on binary and multiple stars. Includes newly-discovered systems or orbits, and astrometric and spectroscopic data.
Access the Finsen-Worley Catalog, supplemented by all subsequently published orbits of visual binary stars. Includes a table of rejected objects.
Click-through tour offers animations of interacting binary stars and an overview of some of the complex facets of these systems.
Use the provided orbital elements for selected visual binaries to calculate the position of a companion to its primary for any desired date.
Table on the orbits of 150 visual binaries features diagrams and a range of technical data.
Catalog, maintained by the U.S. Naval Observatory, is the world's principal database of astrometric doubleand multiple star data.
Enjoy an introduction to the visual binaries and their arrangement by constellation. Includes info on William Herschel's binary star discoveries.
Overview of binary systems including an explanation of why "X-ray Nova" is a misnomer. Describes two classes of systems and examples of each.