You are here: Home USNO Astrometry Optical/IR Products Double Stars WDS
The USNO websites,,,,,, and are undergoing modernization efforts. The expected completion of the work and the estimated return of service is Fall 2020, subject to change due to potential impacts of COVID-19.

The Washington Double Star Catalog

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 115,769 systems based on 824,698 means (as of 1 January 2012). The catalog is updated nightly.





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.

USNO Master Clock Time
Javascript must be Enabled