The Washington Double Star Catalog, or WDS, is a catalog of double stars, maintained at the United States Naval Observatory. The catalog contains positions, magnitudes, proper motions and spectral types and has entries for (as of July 2006) 102,387 pairs of double stars. The catalog also includes multiple stars. In general, a multiple star with n components will be represented by entries in the catalog for n-1 pairs of stars.
Read more about Washington Double Star Catalog: History
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