From Tuesday, 2 May 2017 through Friday, 12 May 2017 the Naval Observatory will perform scheduled network maintenance.

Network degradations or outages impacting our product delivery are possible but should be temporary in nature.

For connectivity or download irregularities please notify or

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 141738 systems based on 1581439 means as of Thu May 25 13:23:09 EDT 2017 .