Maintained by: U.S. National Aeronautics and Space Administration, Goddard Space Flight Center (GSFC). The WDC for Satellite Information, Greenbelt is operated by, and collocated with, the National Space Science Data Center (NSSDC).

Summary of Data Held: Information about rocket, satellite, and space probe launches (information on current rocket launches is no longer maintained); satellite orbit elements and ephemerides; descriptions of spacecraft and experiments. NSSDC holds many data from NASA space science spacecraft, accessible to nonU.S. users in off-line form (CDROMs and tapes) by requests directed to the Request Coordination Office of WDCARandS. Some NSSDC holdings are accessible electronically.

User Services: Open to visitors during normal working hours (advance notification recommended). Disseminates spacecraft launch information with newly assigned international identifiers within days of launches. Forwards international data requests for NSSDCheld data. On-line information about NSSDC data holdings may be obtained via WWW http://nssdc.gsfc.nasa.gov, which links to NASA Master Directory and other data and services.

Publications: SPACEWARN Bulletin which summarizes spacecraft launches monthly (also at http://nssdc.gsfc.nasa.gov/spacewarn/spacewarn.html); detailed catalogs of NSSDC data holdings; data books and CDROMs for selected NSSDC data.