Washington Double Star Catalog

Washington Double Star Catalog
Alternative namesWDS
[edit on Wikidata]
The distribution of the objects of the catalog over the firmament is fairly even.

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 June 2017) 141,743 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.