National Aeronautics and Space Administration
NASA Space Science Data Coordinated Archive

About the World Data Center for Satellite Information...

The World Data Center system is an international confederation of data centers originally established in 1955 to support the exchange and archiving of data generated by the 1957-8 International Geophysical Year. A more complete World Data System description is available from the ICSU Web Page.

World Data Center for Satellite Information (formerly the World Data Center-A for Rockets & Satellites) is hosted by the NASA Space Science Data Coordinated Archive. WDC SI has responsibilities for spacecraft launch and other descriptive information capture and dissemination. WDC SI serves as a conduit for requests from the international community for data from the NSSDCA data archives.

WDC for Satellite Information
Mail Code 690.1
NASA Goddard Space Flight Center
Greenbelt, MD, 20771

Acting Director:
David Williams
+1 301 286 7355

General Inquiries and Requests
Contact our Request Coordination Office

Maintained by: U.S. National Aeronautics and Space Administration, Goddard Space Flight Center, NASA Space Science Data Coordinated Archive (NSSDCA).

Summary of data held: WDC SI holds information about rocket, satellite, and space probe launches, although information on rocket launches is no longer maintained current; satellite orbit elements and ephemerides; descriptions of spacecraft and experiments. NSSDCA holds much data, mainly from NASA space science spacecraft, which are accessible to non-U.S. persons in offline form by requests directed to WDC SI, and, for a subset of NSSDCA holdings, electronically with no specific WDC SI involvement.

User services: Dissemination of spacecraft launch information, with newly assigned international identifiers, within days of launches; open to visitors during normal working hours (advanced notification recommended); passes international data requests to NSSDCA for NSSDCA-held data; online information about NSSDCA data holdings at, which links to the NSSDCA Master Catalog and other data and services.

Publications: SPACEWARN Bulletin ( which summarized spacecraft launches monthly, was discontinued in 2011.

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