G.C. Galiardi,
R.E. McGuire, Code 632, NASA/Goddard Space Flight Center, Greenbelt MD 20771 1-301-286-7794, Robert.E. McGuire.1@gsfc.nasa.gov
R.T. Baldwin,
T.J. Kovalick,
M. Peredo, Raytheon STX, Code 632, NASA/Goddard Space Flight Center, Greenbelt MD 20771 1-301-286-1526 Mauricio.Peredo.1@gsfc.nasa.gov

This paper describes the capabilities and implementation of the Satellite Situation Center's new Web-based interface. The SSC system includes a database of some 44 missions maintained with the latest definitive and predictive ephemerides. SSCWeb simultaneously supports key facility operations of the NSSDC's Satellite Situation Center and the ISTP Science Planning and Operations Facility (SPOF) with the same database and software now available to all users.

SSCWeb supports output of spacecraft locations in many different coordinate systems and with various field parameters and geophysical regions as desired. The software can also list various kinds of conjunctions including region co-occupancy and radial or magnetic alignments of spacecraft or spacecraft with ground stations. The interface operates in two modes (standard and advanced) to support both new or occasional users along with users needing to tap more complex capabilities of the codes. The Web interface features an innovative use of "hidden fields" to allow users to save and restore query specifications on their local machines without the need for the server to track their individual "sessions." Restored and fully Web-based SSC graphics functionality will be demonstrated, supplementing the powerful listing and logical query capabilities of this system.

The SSC and SSCWeb are a joint effort of the NASA GSFC Space Physics Data Facility (software development and project management), the National Space Science Data Center (SSC operations staff) and the ISTP SPOF (shared leadership of the system science design and operation of the current physical SSC server). SSCWeb may be accessed at this URL