The Washington Double Star Catalog (WDS) maintained by the United States Naval Observatory is the world's principal database of astrometric double and multiple star information. The WDS Catalog contains positions (J2000), discoverer designations, epochs, position angles, separations, magnitudes, spectral types, proper motions, and, when available, Durchmusterung numbers and notes for the components of 141828 systems based on 1584640 means as of Wed Jul 12 14:16:58 EDT 2017 .
The Washington Double Star Supplemental Catalog (WDSS) is a database intended for large, faint duplicity surveys. This initial version only contains the 105,000-pair SDSS survey by Dhital et al. (2015 AJ 150, 57), with additional matches of some pairs against 2MASS. However, it is expected to grow significantly as future data releases from Gaia, PanStarrs, etc. lead to ever-larger-scale duplicity surveys.
If the WDS and associated databases were helpful for your research work, the following acknowledgement would be appreciated:
``This research has made use of the Washington Double Star Catalog maintained at the U.S. Naval Observatory.''
A notification of references to relevant papers is appreciated.